Hi, thank you for your question. If you are not claiming for an exact amount, but for a range between £10,000 - £25,000 then the court fee will be £1,250.
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No worries - please see government guidance here under heading "if you do not know the amount": https://www.gov.uk/make-court-claim-for-money/court-feeshttps://www.gov.uk/make-court-claim-for-money/court-fees