> travel adapter convertor is plugged into a socket convertor because UK uses
> three inputs for the electrical socket rather than two like everywhere else.

Loads of places have provision for 3 connectors, it's for the earth
which is essential with devices which can be made live. Pretty much
anything metal. It also provides a safety feature since until the earth
gate is opened, the live and neutral outlets are protected by a shutter.

I wouldn't worry about it getting hot, just check that everything is
suited to the right voltage.

David.