If you look more closely at the WIKI you will find this bit:
LABC Issues
As mentioned above, some LABCs are spreading misinformation, either by accident or design, about the status and acceptability of electrical work done by DIYers or other non-registered people.
These include:
1) Stating that such persons simply cannot carry out notifiable work, and that it must be done by registered electricians. The legislation referenced above, Statutory Instrument 2004 No. 3210 The Building (Amendment) (No.3) Regulations 2004 makes it quite clear that this is not the case. LABCs are not allowed to refuse to process Building Notices submitted by non-registered people.
2) Stating that work carried out by a non-registered person must be inspected and tested by someone who is registered, or who they regard as qualified. Again, there is no mention of this requirement in the statutory instrument.
Recently the DCLG issued a circular to local authorities making it absolutely clear that they are not allowed to do this:
http://www.communities.gov.uk/index.asp?id=1131042
Additionally, the new Approved Document P now explicitly says
1.26 The building control body may choose to carry out the inspection and testing itself, or to contract out some or all of the work to a specialist body which will then carry out the work on its behalf. Building control bodies will carry out the necessary inspection and testing at their expense, not at the householders' expense.
Unfortunately, many LABCs have been simply ignoring what the DCLG say, and persisting with their policy of requiring DIYers or other non-registered people to hire someone to inspect and test the work. The DCLG's position on this appears to be that if you are being told this by your LABC you should take them to court.
Suggest you read this carefull and the embedded links. its an eye-opener and gives good ammo when BCO start with their bovine scattology.