Manners1983
The following companies use GIS in UK from Digitising to Asset Management
Infoterra - They do jobs for RPA , Basic Digitising jobs for various landuse maps and Agriculture areas. ( Arcview and customised database collection)
Scottish Water - They use Small World ( Which is a Bit different) and Mapinfo for other analysis.
National Grid - Arcinfo - Their Training is worth every Penny
Otherwise a good number of council's use them for planning.
MWH , RPS Water Plc , Atkins , Thames Water etc
Advice - If you are good in database management and SQL , then u sure will be an asset to any organisation - Know your data and advice on its managament you will be the cream for that organisation.
Ta for now and hope it helps
Trust me GIS is an amazing subject if known to be utilised
Regards
rashvk
Hope this helps in planning your further employment.