alphamatt - I'm the bloke.
Any jobs at Barton are advertised on this page:
City Airport Manchester - North West Aviation | General Information
as and when they become available. There isn't anything at present though.
If you are interested in becoming a FISO though, there is nothing to stop you from self studying for and taking the written exams for the FISO licence - that would probably stand you in pretty good stead if any jobs became available at any FISO airfield in future. Details of how to gain a FISO licence are on the CAA website here:
Flight Information Service Officer (FISO) Licensing | Air Traffic Standards | Safety Regulation