bus lane

If you were caught on camera, you’ll get an FPN, with the usual deal that paying within 14 days (or similar) reduces the fine. “First time offence” considerations are for court appearances, not minor stuff like driving in a bus lane, unless you felt like challenging it, which probably isn’t worth the time and effort.

Normally these things are council-controlled and (as was demonstrated by a notorious example in Newcastle) can be a huge cash-cow.