Honestly as a maritime nation, I don't quite understand why the UK isn't leading on launching from barges: with so much coastline, there are potential spaceport

Honestly as a maritime nation, I don't quite understand why the UK isn't leading on launching from barges: with so much coastline, there are potential spaceports all over the country, with associated potential employment opportunities etc. etc. And with such restricted space the nimbyism here is always going off the scale. Far better to neutralise these people by moving it offshore.