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BS 1363 Part 2:1995 gives 13A max.
Which page?
The BS standards are a bit weird in defining a number of practical tests a device has to pass (including 14A + 6A) rather than just having nominal specs they need to meet.
It is bizarre given how rigorous the rest of the electrical regs are about preventing overloads that unfused double sockets that can't take 26A are apparently perfectly fine.
I'd imagine decent sockets could handle more than 13A but the BS 1363 Part 2:1995 gives 13A max.
If there was an electrical fire and the insurance assessor found you were running a 20A load off that socket...