1) @BBCkatyaadler is right, fishing is not a major contributor to UK GDP;
2) It IS significant for those that work in it, their communities and their families.
3) This overlooks what's actually on the table.
People (not Katy) often talk about fishing's contribution to GDP like if the UK gives ground the UK fishing industry will cease to exist.
I don't think there's a lot of evidence to support that conclusion.