Interesting topic this, been casting an eye over the same subject on the screwfix forums for a while as well - some very irritated sparkies over there!
My question is, who is the onus on to prove when the work was carried out? Lets say I fiddle with my electrics in February 2005 and dont get it certified. When I sell the house in the future, and tick the 'I havent done any electrical work during my stay' box, even if the electrics do blow up after I have left how can it be proved it was done in Feb 2005 not December 2004 before part P came into force?
I agree the colour change to wiring is going to be an indicator, but this is to match the EU, not for part P. I have supplies of both, and red/black earth is still readily available - I bought a reel to add sockets to a conservaroty last week from B and Q.
If you want to be compliant with the law when selling your house, whats to stop people doing DIY stuff themselves rather than pay a spark, then just get the electrics tested/certified before you move so you have a certificate to satisfy the buyers solicitor? This is a suggested part of buying a house anyway, although I suspect its rarely taken up. Looking at it from the other side, would you not buy your dream house because the electrics did not have a part P certificate? If the answer is no, you would still buy it then surely part P becomes irrelevant from a moving on perspective?
Handymac, on your website you say that 5-6 possibly less deaths are due to mains faults, yet on here you mention forensic examinations and fingerprints. Are these two points of view compatible? This is not meant as an attack in any way, I just dont see the problem being as draconian as you suggest for the future - possibly because I am not in the trade as you are?
I guess we will have to wait and see how things pan out but for now at least I shall continue to do my own electrics and deal with the problem of certification if it arises when I come to sell. How many of the general public do you think will have heard of part P and know to ask the spark they hire whether he is compliant? I suspect not many!
Steve