We do not recommend that you carry out this work yourself unless you are competent to do so
Answered by Rupert, Electrical Safety Expert
We do not recommend that you carry out this work yourself unless you are competent to do so. However, the information regarding old and new wire colours is available on our website if you are competent to carry out the work. https://www.electricalsafetyfirst.org.uk/guidance/your-questions-answered/questions/what-are-the-colours-of-electrical-wires/
Furthermore, we always recommend that you use a registered electrician for any work in your home. This gives you the peace of mind that if something does go wrong, the work is insured and their scheme operator can help you if you are not satisfied.
You can find an electrician local to you here.