SERCOprovide the atco's at Biggin Hill, although it may be better to have a chat with the Manager ATS initially, as they will obviously be aware of current and future requirements.
Like all units, they are short of atco's, and there isn't exactly a queue of atco's, within or outwith SERCO, to volunterily go to Biggin Hill.
If you can get a job as an atsa there, and show the aptitude, Serco are pretty good at providing onward training their own staff.
You can expect to be bonded for several years in return, and could, theoretically, be posted elsewhere to any of Serco's other UK stations - small beer in return for the licence and ratings.
Suggest you have a chat with the Satco, (sorry - don't know their name), and follow it up with a top CV to them.
You could also send the same CV to Sally Johnston, Head of Operations, SERCO, Bartley Wood Business Park, Hook. Hampshire.
You may get a standard reply, or you may be lucky.
Either way it's worth a try.