I've spent several days reading web sites and posts on Part P but it's all too conflicting. Can anyone tell me whether the following are legal to do DIY:
In an airing cupboard in a bathroom. Insert a (battery powered) timer between the (MCD protected) live wire and the wall mounted, 13A fused switch connected to a 3KW immersion heater. No wires to be added. [Irony: if I can't do it, I won't; consuming more electricity. So much for the ecological goals of the regulations].
Replace the flex for the above with an identical one. [Irony: if I can't do it, I won't; leaving in place a flex with the insulation getting very brittle. So much for the safety goals of the regulations. More irony: according to the regs I can't upgrade this wire. Is a flex to a 20-year old specification as good as a recent one?]
Replace the three way valve in my CH with an identical one. Valve is Honeywell Y Plan V4073A1039 with it's own flex, so the wiring to the connection blocks, as such, doesn't change.
Replace the timer in my CH with a system compatible but better one, without wiring change. E.G. Honeywell Y Plan ST6400C1003. [Irony: if I can't do it, I won't; consuming more power, the current timer doesn't support independant Heat and Water. So much for the ecological goals of the regulations].
If legal, any tips/gotchas on doing the the above two tasks would be appreciated.
In the kitchen: Replace the hot water inlet solenoid on my Washing machine.
In case it's relevant: CH Boiler, CH Pump and Mains Distribution Unit were upgraded (and the house was Building Control inspected ) two years ago.