Unless you got an absolute idiot of a copper then I would be highly surprised at any implications. There's been no illegal action on the part of Happytalk what so ever. A genuine mistake has been noticed & the appropriate action has been put in place to solve the issue without unnecessary costs.
If anything illegal had gone on with the plates that's on the car now, I'm sure it would catch up with Happytalk eventually once the situation had been solved.
In my opinion any sensible police officer would give you a week to solve the problem like they have done with people I know who for instance have had lights out etc.