It is city and guilds it seems quite a basic course though the level 2 diapolma in electrical installation. And more for people with no experience at all in the building trades. I already have quiet abit of electrical knowledge from the electrical section in my nvq level 3 in plumbing and from working in the trades.
As Sharpend suggests, although you may have some reasonable experience and limited related qualifications. If you want to be fully qualified for all aspects of electrical work, you will need to do the same full course content as others who are fully electrically qualified...
While there will be an element of overlap from what you already know. Until you have done the full course and passed the examinations, you will not know which bits were not covered on the plumbing related electrical work..
To look at it from the other side of the coin...
I am fully qualified for my electrical work..
and as I know how to solder cables I can also solder copper pipes..
I can join a few bits of pipe together, (solder, compression, push-fit), 15mm or 22mm...
I know how to connect up heating valves for S-plan, Y-plan, replace heating pumps..
Install showers.. replace taps, ball-valves,
Remove, replace and bleed radiators,
Disconnect & replace a toilet, bath, sink, shower tray etc..
So can you tell me a short cheap City & Guilds course, so that I can call myself a qualified plumber?
without spending too much time or money as I already know the basics?
After all.... if I get it wrong it's only a bit of water leaking where it shouldn't..
It's not like it can kill a healthy adult in less than half a second like that invisible electricity can?
I think you have got to either bite-the-bullet, (AKA take-the-bull-by-the-horns),
and take the proper courses in the correct sequence..
or change your objectives and plans.