No, not unless they're public buildings where people work.
BUT it is however, illegal to sell, manufacture, display or store them.
You could do what you like in a house but in a hotel you'd be screwed!
The only way you can supply 110V to sockets legally is to use keyed BS546 plugs or IEC connectors (the most common way)
Pretty much: BS1363 is the standard
Schuko and BS546 are acceptable alternatives
and other EU standards are acceptable but only in so far as they're not specfically outlawed and only because they have to be under some EU directive or because we're trying to be Euro-friendly.
Oz/China/Argentina is not legal nor is NEMA or Israeli.
It's 100% illegal to sell an applience with anything other than a plug conforming to IS401 / IS401/A (i.e. BS1363) though. Unless, it's a shaver or similar device intended for connection to a specialised bathroom socket which should be fitted with a Europlug conforming to IS EN (whatever Europlug is)
OR where a Europlug/CEE 7/IV is fitted an appropriate adaptor which can only be removed with the use of a tool is fitted making it suitable for engagement with an IS 411 socket (BS1363)
