A comment made in jest on another thread got me thinking - wouldn’t Cornwall be a great place for a UK 140.6?
Nearly unlimited choice of sea swims, run could include coast path / castles / fishing village type vibe.
Good weather by UK standards.
Already a holiday destination so plenty of accom options and plenty for the support crew / family to do. Make a week of it.
Nothing against Bolton, some of my best friends are Northerners (*is Milton Keynes north?) but somehow the draw has never been quite there for me. But Cornwall - bring it on.
And of course as Gingerbongo points out, the USP of the pre race pasty party.
Would Newquay work for example? I am not sure about bike routes & think that’s probably always a sticking point.