If one checks for heat in the plug periodically, and there is none evident, how likely is it that something will blow up with no warning?
Unlikely TBH.
Depending on your usage pattern, I would suggest that about once every month or so (when the car has been on charge for a good few hours) place the back of your hand on the back cover of the three pin plug.
It is normal for it to become warm to the touch, but if it is hot then this indicates there is a possible problem developing.
As part of your periodical checks, when the socket has cooled right down, try removing the three pin plug from the socket outlet.
Do you need to use a LOT of force / effort in order to remove it from the outlet ?.
Is there ANY evidence of brown staining to ANY of the pins ( likely to be evident on the live or neutral pins ) or on the white oblong face plate entry slots of the socket outlet ?.
If so, these are early signs that excessive heat is being generated and further investigations should be carried out ASAP.
I did notice as part of my regular checks, that LIVE side of the socket outlet and the LIVE pin of the three pin plug became the warmest points of course, as this is carrier for the in-line 13 Amp protection fuse.
I did conduct regular checks, as we have an integral garage.
I did have a similar problem at my Mum's house a few years ago now.
A recently installed microwave was in constant use by her care company.
Then after about 9 months, one day the micro wave just stopped working.
I assumed ( incorrectly ) that the microwave had prematurely failed.
When I tried to unplug it from the socket outlet, that was located behind a fridge freezer.
The three pin plug was completely bonded solid into the socket outlet.
I turned off the power at the C.U. and had to prise out the plug out of the socket outlet with a large screw driver.
The house was almost 50 years old and never been rewired, but the line conductors in the cable where fine, strangely enough but the socket outlet itself was totally cooked.
It was only ever used to power the upright fridge / freezer for about 45 years with no issues.
Until the microwave arrived to assist with her needs.
The increased load on a constant daily basis over some time, had found a weakness in the termination terminals in the rear of the outlet.
A change in demand and increased usage, manifested into a problem that was not evident before.
Socket outlet replaced and normality was resumed.
Only going to prove that high demand items are always going to find a weaknesses in an install.
Before we started using high demand items like electric showers / induction hobs and EV wall boxes etc, problems on installs ( especially in older homes ) where fairly uncommon.
One of the benefits of having a wall box fitted on a older system, means that it will be installed to the latest safety standards & regs.
Many people running on an older system worry about having the need to have there house completely rewired in order to accommodate a wall box.
This not always the case.
Wall boxes can be installed by leaving the house wiring completely separate and untouched.
A new suitable standalone C.U. can be supplied from split feed from the meter tails to power the new wall box.
The CPC / Earthing conductors to the water and gas meters made require an upgrade to latest specs ( as did mine on our house that was first built in 1982 ).
Wall boxes are not completely exempt from over heating issues of course, if it's a bad install is carried out or poor quality materials / components are used or loose terminations are discovered of course.
