Do you mean that you filed (submitted) a Witness Statement and an Out of time application to the Traffic Enforcement Centre at Northampton County Court? Perhaps towards the end of last year? When?
If so which ground (option) did you tick on the Witness Statement?
Do you have the TEC's revoking order mentioned in the letter? If so, please post it up.
I would expect that the revoking order revokes the Order for Recovery and cancels the Charge Certificate. The underlying PCN could still be enforced by serving you with a new Notice to Owner.
If the TEC have revoked the Order for Recovery then the Council should arrange to refund all of the money paid as any bailiff enforcement would be null and void. The Council would have been informed electronically when the Witness Statement had been filed and again when it was accepted and the order issued.
You could also seek help from
Bailiff Advice Online. There maybe a small fee.