I am an FtM/trans man currently undergoing hormone treatment prior to genital surgery, I haven't registered with my GP as male and have recently been invited for screening. Should I still go for my smear test?

As you still have a cervix you should still consider having your cervical smear. Cervical Screening Wales will routinely invite you if you are 25-64 years old, registered with a GP as a woman and live in Wales.