Trial Fees:
If a claim is defended, the court will set a trial date and specify by when the trial fee must be paid. Small claims court fees are less expensive that other claims.
If the trial fee is not paid, it will likely lead to the claim being struck out or the trial not going ahead. Most listing orders now state as standard that failure to pay the trial fee will result in the claim being struck out automatically. It is important therefore to pay the fee on time.
The trial fees are currently:
Claim Value Fee
up to £300 £25
£300.01 – £500 £55
£500.01 – £1,000.00 £80
£1,000.01 – £1,500.00 £115
£1,500.001 – £3,000.00 £170
£3,000.00+ £335
Failure To Pay A Court Fee
If you do not pay the issue fee (unless a remission applies – see below) the court will refuse to issue the claim and likely send all the papers back.
It is important to pay the trial fee on time as if you do not, your claim could be struck out by the court, meaning the court will not allow you to pursue the claim any further and the claim is dead. If you miss the deadline, the court might set a different date but that is very dangerous to rely upon as more likely than not, the court will strike the claim out and will likely state that on the order specifying when the trial fee falls due.
https://www.smallclaimscourtgenie.co.uk/small-claims-court-fees/