If there are pushy about you seeing some random GP .. Go .. Total waste of money of course.
If your meds are working and dont need to be adjusted well then just keep follow ups with your Pdoc .. If you need a change do not let this GP do anything .. It always winds up being a cluster **** and then its an uphill battle to find stability again.

If its a goverment paid service this appt would be considered "wasteful" and they can be reported as such.. just fyi.