I am a locum, is the VetGDP still a requirement?

Yes, it is.

This may make it more awkward for you to find a VetGDP Adviser. You need to work in the same practice as your VetGDP Adviser for at least one hour a week, but there can be a sensible use of flexibility around your work patterns. Practices may not employ you unless you have an Adviser, although they can be in another practice. You may change your VetGDP Adviser where necessary.

Even if you are working as a locum part time, you still need to engage with the VetGDP.