What on-site experience do you have? If it's none you're going to be considered an electrical labourer or 'mate'.
The stages are as follows:
Apprentice - there to help clean up, make tea, get butties, pull cable, clip stuff, do jobs nobody else wants to do, learn a bit when someone can be available to show you. (£4.81-9.50/hr)
Mate - there to help clean up, pull cable, clip stuff, do jobs nobody else wants to do, learn a bit when someone can be available to show you. Like an apprentice but on much better money. (£12-15/hr)
Improver - works with the 'fully qualified' and/or experienced electricians. Doesn't know the job inside out yet but is handy with most things and can be left to do them on their own. Should have some base qualifications like BS7671 18th Edition and CSCS/ECS card. On decent money. (£15-19/hr)
Electrician - like an improver except is expected to know how to figure things out and make jobs work alone or in a team. Should be able to figure out how to install unknown stuff by reading manual and/or schematic. Should know how to test and bell stuff out. Makes a couple of quid an hour more than an improver. (£16-24/hr)
The above is for site work. For private work all bets are off and it depends what you can negotiate with the main contractor or customer. I'm subbing at the moment. Last week i was on £18.50 an hour for 2 days, then £175/day for 3 days, and next week i'm on £1300/week. So highly depends on job (i'm considered an improver, and i ditched an apprenticeship at £9/hr to go it on my own).