Jack
Unlikely, I know, but if you've got £30k spare, you could fund your own training at ASTAC, Gloucestershire Airport or BAE Systems, Cwmbran; the only two other approved UK ATC Colleges. I know ASTAC also have their own 'cadetship.'
A large proportion of the non-NATS units have 'in house' training policies, often sponsoring their ATCAs' training, so it's worth writing to the ATS Managers at wherever you want to work.
First and foremost, though, make sure you meet the CAA's Class One medical standards. Simple things like colour blindness and diabetes can rule you out.