There is no Small Claims Court
There is no such thing in the UK as the "Small Claims Court" (whatever Which says). There is the "Small Claims Track" in the County Court.
This matters because if a case is dismissed _before_ it is assigned to a track, the standard rules for costs apply - the loser pays. It is not beyond the bounds of possibility that the financial institution will decide to fight, and apply to dismiss the case on the grounds that they don't dispute they owe "Barrie Shepherd" £2000 - but they are obliged to check you are the Barrie Shepherd they owe the money to. If they succeed, they could end up stinging you for £lots costs (rather more than £2000).