shops in the UK are STILL restricted to six hours of trading on sundays, the law was last changed in 1994[1] and the number of hours that a shop may open on a sunday is determined by the shop's size.

there are some exemptions such as airport shops, petrol or motorway service stations, etc.

the main reason there are still legal restrictions on sunday trading are advocacy groups such as "Lord's Day Observance Society" and the "Keep Sunday Special" campaign.

[1] https://en.wikipedia.org/wiki/Sunday_Trading_Act_1994