Mike, those plugs are rubbish. I have also replaced several of them too.
First one to go was on our vacuum cleaner, replaced it with one of the old rubber extension lead plugs.
Other one was on an oil heater which I didn't trust as it ran too hot for my feeling and chopped it off. put one of the older tap on plugs on and no more excessive heat in the lead.
Typical a bureaucratic designed plug with no thought about burning a house down because of reduced ampacity to fit some stupid plastic sleeves on it.
I often go for a walk about on inorganic rubbish days and cut plugs and good leads of dumped appliances, these often yield good tap on plugs and other older style properly designed plugs from before the PC safety days.
