What make is it? MK, for example, don't do single-pole ones.
Alternatively you could stop worrying - removing the plug from the socket is an acceptable method of isolation, so then it doesn't matter whether it's got a single or double pole switch....
If you have a tester check for continuity between N in and N out with the switch in the off position. If there is continuity with the switch off it is single pole, if no continuity it is double pole.
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