As Patch said if you have a job stick with it, and start with the 2330 route, longer but more inline with the long standing Sparkies on here
If you're out on your ear, then as said look at the quals that the Part P providers list, which typically are Part P, C&G2382 (17th), 2392 (Lv2 Inspect&Test) for Limited Scope (Domestic Installer) + 2391 (Lv3 PIR) for full scope, however with these alone it would be inappropriate to call yourself an Electrician, you would need 2330 as well at least
Right now the economy is booming for re-training ; \, like any service it's often it's good Applaud Smiley, sometimes not so good :| , and in many cases downright dubious :_|X( X( , if your lucky you'll find someone you trust who has been that route and can give you the benefit of hindsight
As to the course, you can spend