We don't have blackout areas. In fact, quite the opposite - local radio is usually the place to find your team's game live.
There's a time slot blackout that no Saturday 3pm soccer games can be shown live.
There is local TV, but not really. There's little local programming (mostly news), and the regions are all rather large.
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Surrey has a rep for having a lot of Man U supporters, with the joke when they lose in London being "oh well, at least the fans don't have far to travel home".
That's about it for football - big teams have a wide geographic spread, but typically there's a link (family, migration, etc), rather than brazen glory hunting. This is why Surrey stands out.
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Rugby has seen some teams stadium hop every decade or so as contracts need and so leave pockets of fans behind by the old stadium. It's not the same as a franchise move, and more due to finding the best offer from a soccer club to use their stadium.
Eg London Irish moved from West London to Reading. Not a huge distance but left an area with a few teams to an area with a lot of people who'd travel the hour or so to those West London teams. The journey is just flipped around. It's like New York's football teams playing at the Meadowlands, except - with the UK's smaller geography and much more dense scattering of teams, this could have been seen like MK Dons. It wasn't, but it could have been. In UK sporting geography, London Irish weren't local to London for the 20 years they played in Reading (they have recently returned to West London, playing at Brentford's new stadium).
And London Wasps (dropping the London in the process) moved from QPR's stadium to Wycombe's in a similar move, before moving to Coventry's, which is a much bigger move geographically and leaves their formerly local fans as far away - just has happens when a US franchise moves (and unlike MK Dons, they didn't hate the club for moving north and abandon it).