http://www.caa.co.uk/application.asp...e=detail&id=39
This will tell you what is involved in getting a FISO licence, then read CAP410A & B (available on the same site). Personally I wouldn't bother unless you can find an airfield that would be willing to take you on once you got the licence. You will then need to do 40 hours MER before you could validate and during this time they are unlikely to pay you anything.
It will be a few hundred quid and a fair amount of time. Only you can decide if it is worth it. Personally if I were interviewing it would impress me that someone had taken the trouble but then I am not doing the interviewing.
