OP
beachlover
Theories they are indeed, and with or without theories or headscratching or doing nothing at all-you will still have a blown computer. So theories are not hurting or adding to your problems.
Power analysis is a way of establishing some facts. Maybe I am wrong fully accepted and I do offer this very tentatively, but at least you are out of the realm of theory and into facts. What would it hurt to try it, well apart from your bank balance. At least if you turn off the PV you should be able to find out if it is a contributive factor without power analysis.
Maybe your landlord would put something toward power quality analysis monitoring?
I think I would be looking into a Harmonics filter for single phase. The energenie power meter would in no wise give power quality analysis. A meter for this type of work costs upwards of £1500. There are companies that specialise in this. However it is not cheap. And finally it may not be the answer. I promise I wont talk about this again.
I have added it to the list to ask the electrician on Monday
Thanks