The pitch is that you are borrowing somebody else’s expertise. Look at what actually crosses from their account into yours, and most of what decides your result never leaves your side of the arrangement.
What does the follow button actually move?
The offer works because it compresses into one action. Find an account whose chart slopes the right way, press follow, and the same trades appear in yours. It gets described as delegating to a specialist, in the way you hand a tax return to an accountant and stop thinking about it.
The comparison breaks in one place. An accountant works from your circumstances, and a lead trader works from theirs and has never seen yours.
A trade is also five decisions rather than one: the instrument and the direction, the size of the position against the balance behind it, how much adverse movement gets sat through, how many nights it stays open, and underneath all of it whether to keep going at all. One of the five crosses cleanly. The other four arrive welded to a situation that is not yours.
Why does proportional sizing not settle it?
Copy platforms allocate as a share of equity, which looks like the objection answered before anyone raises it. Commit 2% of your balance where the lead trader committed 2% of theirs and the exposures match. The arithmetic is correct. As a description of what the two accounts then go through, it is incomplete.
Look at the range of balances that arithmetic has to span. Across seven UK platforms opened and funded for testing, account minimums differ by more than two orders of magnitude between the cheapest and the dearest door into the same kind of product. Two people whose balances differ by a factor of several hundred can both be told they are running the same strategy. Percentages scale smoothly, and minimum trade sizes, rounding and per-transaction charges do not, so the small account meets floors the large one never notices and the copy it receives is an approximation of the trade it was promised.
Whose nerve is being tested, and who knows what first?
A 30% drawdown is unpleasant, survivable and an ordinary feature of plenty of defensible approaches. Whether a particular person sits through one depends far less on the approach than on what the money is for. Somebody running a slice of long-term savings complains at dinner. Somebody whose deposit is also a deposit on something else does not.
The commonest failure follows from that, and it is foreseeable rather than shameful. The follower closes at the bottom, which is the worst available moment and the only one at which the feeling arrives at full strength. Calling that a lack of discipline misreads the arrangement, because the size was set against somebody else’s balance sheet and somebody else’s tolerance, and the person carrying the feeling agreed to neither of them.
Most of the trouble here comes from timing rather than character. In the ordinary case the lead trader conceals nothing. They hold every piece of information first, and some of it never gets written down, because nobody is obliged to narrate a decision to strangers.
Read the register below as a description of the arrangement rather than an accusation about a person. Nothing in it requires anybody to behave badly, which is exactly why choosing an honest lead trader does not remove any of it.
| Event |
When the lead trader knows |
When the follower knows |
| A position is opened |
Before it is placed |
After the copy has filled |
| The reasoning behind it |
At the point of entry |
Never, unless it is posted |
| Conviction starting to go |
Privately, in advance |
From the equity curve, weeks later |
| The approach quietly changing |
As they change it |
By inference, if at all |
| Winding down for good |
The moment they decide |
When the copies close or the account is delisted |
An asymmetry register. Every row describes the arrangement rather than any individual, which is also the honest limit of a table like this: it gives the shape of what you are entering and tells you nothing about the person you chose.
A fund outlives its manager and a lead trader does not
Set the arrangement beside the other ways British savers hand money to somebody else. A fund has a mandate, a prospectus, an investment committee, a named successor when the manager leaves and a published procedure for winding down. Every one of those exists so the arrangement survives the individual running it.
A copy relationship has none of them. What you are buying is one person’s continuing willingness to keep making decisions, which is unpriced, revocable without notice and owed to nobody. Their judgement is also the thing no dispute process reaches: the regulated firm is the platform, and the person whose decisions cost you money is another of its customers rather than your adviser.
Redress is not rare in this market, either. The Financial Ombudsman Service recorded GBP 283m of UK investment complaint redress in the first half of 2025, up 20% on the previous half-year while complaint volumes rose 10.1%, so the money paid out grew at roughly twice the rate of the cases.
What is the lead trader paid on?
Worth asking in exactly those words before following anybody. Does the remuneration move with the amount of money following the account, or with what the followers end up holding at the end of it? Where a platform publishes its programme terms they are readable in a sitting, and where it does not, the absence is part of the answer.
The two answers select for opposite behaviour. Where payment tracks assets under copy, the variable a lead trader can most directly influence is attention, and attention is won by a steep month rather than a quiet decade. A plainer asymmetry sits underneath. Once the copied capital exceeds the lead trader’s own, which is the entire point of being visible, the downside they feel is a fraction of the downside they cause.
The easiest thing to measure is the least decisive
Funding an account and following somebody does answer a set of questions properly. Whether the copy fills near the price the lead trader got, what that gap is worth across a hundred trades, what the platform charges for the service, and what happens to an open copy at the moment you press stop. None of it sits on a marketing page.
That is the part real-money testing was built for. The team at The Investors Centre opens and funds live accounts with its own money to test UK trading platforms, rather than compiling rankings from providers’ published fee schedules.
Now set that against everything above. Charges are the cheapest component of a copy relationship and the easiest to price. Sizing, tolerance, holding period and one person’s willingness to continue are the expensive ones, and a method built on funded accounts prices the small variable to the penny and the large ones barely at all. It settles the narrow question and leaves the wide one where it was.
So what does a defensible version look like?
Probably a small allocation, treated as a cost rather than a plan, following somebody whose approach you could describe out loud without reaching for the word system. If you cannot describe it in a sentence, the button is standing in for a decision you have not made.
Two things follow. Set a total allocation and stop managing size trade by trade, because the platform formula owns that and you do not.
And write down in advance what would make you stop, because stopping is the one decision the arrangement leaves entirely with you, and it arrives at the point of maximum discomfort.
…
