Technically of course it's wrong, but in general... Everyone does that here in Europe. England is way shorter to say than United Kingdom (and no one abbreviates it in speech). Only when you really want to work out some difference in the UK you can start mentioning Scotland/Wales/NI and when you then mention England it's clear that you only mean England.
Or around topics like football.
Same way when you say Ireland you only mean the Republic unless it's clear you mean something else.
Technically of course it's wrong, but in general... Everyone does that here in Europe. England is way shorter to say than United Kingdom (and no one abbreviates it in speech). Only when you really want to work out some difference in the UK you can start mentioning Scotland/Wales/NI and when you then mention England it's clear that you only mean England.
Or around topics like football.
Same way when you say Ireland you only mean the Republic unless it's clear you mean something else.