Not necessarily LTNman. The U.K. has a 'fragmented' ATC system, most ATCOs work for NATS/RAF, but many others are employed by 'Non-State' ANSPs, of which EGNC is one, along with EGNM, EGNX, EGKK, EGBB, EGNT etc.
There is no such thing as "an apprentice" in ATC.
You need to have undergone a CAA medical, basic training course, and then further courses on Aerodrome Control, and Approach Control. That's about 30 weeks in total.
THEN, you can start training at Carlisle....That could be another 20 weeks before you can do it on your own.
Even if you came to Cumbria from Heathrow, you can't just sit down on day 1, plug in and do the job, unsupervised.