"Rejoin" implies that you departed from that aerodrome.
What angle are you looking at this from? If you say "Manchester Approach, GABCD request join" or somesuch, and get a clearance straight from that you'll be very lucky - expect to be asked to pass your message, so you'll end up giving the whole lot then.
From a controller's point of view, I need to know who you are, what you are, where you are, what level you're at, where you're from and what you want to do in order to be able to issue a clearance. Effectively you're filing an abbreviated flight plan ("booking in" if you like) over the RT.