I done EX 07 and EX 08 for petrol stations, at a centre in somerset.
http://mysite.wanadoo-members.co.uk/prhurt
It was well in excess of £1000 plus £200 for accomadation.
They will send you a free quide and it tells you what you need knowledge in.
Tell them what work you want as there are various EX courses,
Not sure if they do the lower number EX courses though.
Only 7 8 9 and 10 I think.
It was a very intense course crammed into 5 days.
It is broken into parts, and you can return to do just the parts you fail if required.
There is a lot on H+ Safety.lots of paperwork and form filling for permits,risk assesments,method statements etc.
Terminating swa with increased earth terminations, terminating pyro.
You needed to know all about , psc currents, fuse discrimination, safe isolation,flashpoints, EX enclosures, ip codes,etc.
They teach you some, but you needed the basic stuff, to build on really.
And you needed to listen and take note as it done my head in as it was so fast.