No, there are four. In Wales, it is Welsh. In Scotland it is Scottish Gaelic (pron Gallic) and in Ulster it is Irish Gaelic (pron Gay-lick).

But these languages are not recognised at all in other parts of the UK, especially England. However, given the number of immigrants in the UK, many of whom have problems being understood or understanding english, official help is available for many other languages.

Also, the second language of the UK is that non-english language most spoken by people who live here, which changes over time. Right now it's Polish, but that can change.

Also, it's worth noting that English is itself a movable feast. BBC English, aka "reported speech", is not that common. I can speak it, but I usually speak "Estuary", which is a degenerate slang form of reported. The further north you go, the more the English become infected with Scandanavian, by the time you reach the North East, the local idiomatic English is closer to Beowulf than Shakespeare and quie impenetrable to me.

keep to the Fen Causeway