@JMKC82 Thanks again Joe IMHO there's a lot of hog-wash out there concerning home charging particularly those, like me, not wanting to be sucked in to buying a home charger.
First time I've heard that one though "if you constantly use the 3 pin plug. It 'stresses' the internal wiring, as they are designed for intermittent use. Basically the wiring heats up and degrades. Because you are putting a lot of load (13amps) continuously for 4-6 hours per day, every day...... " Hog-wash again I'd say. Using a purposely designed and equipped external 3-pin socket, wired with appropriate cable direct to the fuse box won't stress your home wiring. Now if you adopt a cheap extension lead then I agree you're going to have problems especially if, where you plug it in, the mains socket is on a ring main - that might be a different matter. Most if not all the concerns out there relate to charging EV's though NOT PHEV's. My current charging regime so far is that I'm charging no more than twice a week for about 4 hours a time.
But a useful topic of discussion Joe and thank you for your input.