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They are decent, not perfect fit but not bad at all. Never had any issues with them pulling away, the faceplates need to be levered off with a screwdriver or similar:
They are these ones so fairly budget end. https://www.ukelectricalsupplies.com/selectric-5m-plus-screwless-satin-chrome-2-gang-13a-dp-switched-socket-with-grey-insert.htm I already had them installed when I moved in but had a few extra fitted and the electrician didn't make any comments (positive or negative).
Most are level but I do have a few that are a bit off (the whole house has them). Hadn't considered it being an issue with screwless ones.
Thanks. Yes they're not far off what i'm after, would quite like painted white if possible but brushed doesn't look bad. How's the quality (snug fit to wall etc)? Do you know the brand?