Attempting repairs can be dangerous.
In many instances work should only be undertaken by a qualified professional.
I am qualified and can be reached on 07747 571292. warwickshire and associated counties.
What you are doing is illegal and can only carried out by a real spark with a certificate. If you do it yourself you will either kill yourself, burn down your home ( insurance will not pay out) and you will not be able to sell it as it could fail inspection.
The fact the RCD is tripping points to an imbalance between live and neutral. I know what you have done but I am not going to tell you what you have done for FREE!!
paul
June 2008