Maiden name is fine.
The important thing is that you use the SAME name and SPELLING on all documents.
Much better to keep your maiden name during visa application process, as it will be same as on your birth certificate, passport etc.
Changing it will only lead to confusion !
If you're going to change any names do it after you've arrived in the UK.
You are not obliged to change your name just because your marital status has changed.
