Yes, there is a prevailing south-westerly wind in the UK. The air comes in from the tropics and comes over the UK.
From wiki:
> Northern Ireland, Wales and western parts of England and Scotland are generally the mildest, wettest, and windiest regions of the UK, being closest to the Atlantic Ocean, and temperature ranges there are seldom extreme. Eastern areas are drier and less windy
But it being very windy isn't really conducive to building wind farms. You want (a) shallow seas (b) stable and continuous wind. That's why if you look at the map of where wind farms are situated they big offshore farms are concentrated on the east coast of England and Scotland, mostly from Norforlk upwards:
https://mapapps.bgs.ac.uk/wind-farm-rare-earth-magnets/
It's not that you can't build them on the west, it's just easier.
From wiki:
> Northern Ireland, Wales and western parts of England and Scotland are generally the mildest, wettest, and windiest regions of the UK, being closest to the Atlantic Ocean, and temperature ranges there are seldom extreme. Eastern areas are drier and less windy
But it being very windy isn't really conducive to building wind farms. You want (a) shallow seas (b) stable and continuous wind. That's why if you look at the map of where wind farms are situated they big offshore farms are concentrated on the east coast of England and Scotland, mostly from Norforlk upwards: https://mapapps.bgs.ac.uk/wind-farm-rare-earth-magnets/
It's not that you can't build them on the west, it's just easier.