The term 'AFISO' was dispensed with years ago; it's now 'FISO (Aerodrome)' to distinguish it from 'FISO (Area)'.
With your prior experience , ambi, you may be able to apply for a licence without having to take the written exams. Contrary to what finally flying said, it IS possible to get the licence then hunt for a job - I know 'cos I did it when I retired from controlling. There should be a list of charges for the issue of the FISO Licence in the AIP.
Depending on your prior experience, you may get a reduction of MER from 40 hours; in my case it was reduced to 20 hours but it's up to the examiner at your airfield to 'make the case' for a reduction with SRG. By the way, you can only claim 4 hours training per day towards the MER.
Depending how far you're willing to commute, you could try Denham, White Waltham, Kemble or Blackbushe.