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2 Gang 13A socket outlets are still rated at 13A not 26A.
You can get back boxes that enable you to put two 1 gang sockets next to each other, then you have 26A as each socket is at 13A.
If it is a spur then this isn't doable as 2.5mm cable is 20A max and more than one socket on a spur means you need to put a 13A FCU on it.
In other words, plug washer and microwave in but don't use at the same time. 😉
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I'm seeing a lot of stuff that says a 2 gang socket is designed (BS Standard) to handle 20amps, 14A on 1 and 6A on the other simultaneously. That would make sense as most high draw stuff is short term (i.e. diversity allows it). I have also read and would assume that some sockets exceed this BS standard. Again this would make sense as the conductors in a plug socket can be pretty beefy which would allow lots of amps.
Cheers. Switching the single socket for a double seems sensible then. It's for a washer/dryer (2.2kw) and microwave (1.3kw).