I only buy or make up 13A extension leads, because sooner or later somebody will use it for a 3kW load. Also use quality stuff. Even then I'd be checking the plugs on a high loading, it's not that unusual to have a poor contact in a socket and any resistance will generate heat.
I don't like extension leads at all. We're using far too many in our rented house - the lounge has one double and one single socket in it, to which are attached 8 things. I've just done a quick spec for the new house - it has 78 double sockets on it! I'm not sure even that is quite enough!
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