It seems shopping is not the only problem
football has also fallen foul of the rules Chester is unusual as when the river dee was canalised and straightened the boarder still followed the old route, so the football clubs grounds were moved from where is now a retail park to reclaimed ground which allowed a large car park to be built, due to the river dee, the bit of Wales where the ground is, can only be assessed by foot or push bike from Wales, there are no road links so although technically in Wales it is thought of as being England and Chester is in English league I think. I don't follow football.
There was a Pub with one bar in England and one bar in Wales, but that Pub has now closed, however the town still straddles the boarder and has one Pub in Wales and one in England. For Pub beer there is no problem, but supermarket beer, Morrison's do a bitter 2% ABV at 90p in England and £1.73 in Wales for 4 cans, and the Christmas special offers were more expensive in Wales, the TV adverts for cheap drink did not apply to Wales, so although not worth doing a trip to England for 4 cans, it was worth if for a Christmas shop.
The result is Welsh boarder town shops are loosing trade. The way we get shops grouped together, it is not just the shops selling booze, but other shops in the same estate. In some cases people don't even realise which country they are in, I lived 12 miles from Cheshire boarder but still had a Chester post code.