Hi mate,I'm a spark myself so I hope I can assist you a bit.
I'm assuming your talking about becoming a domestic electrician as to become an industrial spark like me you tend to need an apprenticeship of some description.
Domestic electrics are pretty boring to be honest,quite monotonous as a hell of a lot of it's pulling cables,channelling,trunking the only real challenge is if your doing alarm systems or something but their only 6 wires or so.
I found the domestic side really boring,it's mainly lacky work.the testing sides a bit more interesting and you should at least look to eventually do that as it's a very interesting course,inspection and testing 2391 city and guilds.the main one to get you started is the 17th edition of the electrical regulations.
This is an open book test which proves you know WHERE to find the information in a very large book which tells you exactly how to keep things within "code".
If you eventually decide to progres to industrial work,automation,plc's,3 phase,drives etc it gets really interesting,learning how to read diagrams,fault finding etc,its really interesting stuff.
I think the only problem you'll face is there's fucking millions of domestic sparks out there right now as a lot of people jumped in when the building trade went silly in the boom but of course now in recession there's a lot of competition.
Plumbing I thinks also had a kick in the balls with the recession but their both good trades to have and there's always going to be work involved with them.
Out of interest,if your retraining,welding pays well,average about £13 per hour and anything "environment" related is good,energy saving etc!!