No before 1st April 1996 as it says Clwyd on the sticker and on 1st April 1996 it reverted back to Flintshire, Denbighshire plus new county of Wrexham. I am a Gog so remember the change both ways, but easy to get dates mixed up.
... but you are assuming that it was not an 'old sticker' which was applied after 1996
If I recall correctly, the Standard harmonising nominal voltage (at 230V) throughout Europe appeared in 1983, but it was not until 1987 that countries started 'adopting' the nominal 230V voltage, but I'm not sure when the UK adopted it.
Based on a recent bad experience - try and find someone recommended and don't just choose off the web. If you are thinking of letting, ask your agent if they have some trusted electricians that they work with.
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