Resignation

Broadly speaking, yes, that's it. Unless there's a new employer in the offing, in which case the below would apply:

221.1. When employment or an apprenticeship agreement has ended (resignation, dismissal or any other action by the apprentice or the employer that results in the apprenticeship agreement ending, with the exception of redundancy) and new employment has commenced within 30 days we do not expect a withdrawal to be recorded. Where new employment has not commenced within 30 days, the provider must, after 30 days, record the apprentice as on a break in learning (see paragraph 224.3). Where the apprentice does not re-start with a new employer after 12 weeks, the main provider must withdraw the apprentice to ensure funds are not paid when the apprentice is not employed.