Just to repeat: you won't be charged wih fraud by TfL, but under their Byelaws for not having a valid ticket - I don't ever recall them taking any other option.The GPhC states that dishonesty (due to a fraud charge) could be a potential reason for getting struck off the registry
Yes, it was failing to disclose the conviction, not the conviction itself, that was the problem - almost any employer will regard that as a dismissals offence.There also some cases where a pharmacist who didn't disclose her three train fare evasions was struck off
Don't panic but do ask for help when you need it.