Small Claims limit is now £10,000
FROM 1 APRIL the maximum you can claim in the Small Claims track is £10,000. That would be the Small Claims track of the County Court if your claim is over a shift you were not paid for, or the Small Claims track of what's technically called the Patents County Court if your claim is over breach of your copyright, for example if your words or images were used without payment or without permission.
Fees start at £25 for a claim of an amount not more than £300 and it appears that the fee for a claim of £10,000 is £210. A major advantage of the Small Claims track is that the other side can't recover significant costs from you even if the court has a fit and you lose.