Due to Sunday trading regulations in England & Wales, large supermarkets are only allowed to stay open for a maximum of 6 hours on Sunday, which is why 24 hour supermarkets have to close by 11:59pm on Saturday night, although most Asda stores seem to close at 10pm on Saturday nights.
In Scotland, supermarkets can stay open for 24 hours on a Sunday, so some Asda stores in Scotland are open 24 hours a day, 7 days a week.
See "Sources and related links" (below) and click on Asda Store Locator, where you can find opening times for your local Asda supermarket.
As of my last update, Asda in Biggleswade typically closes at 10 PM on Saturday nights. However, store hours can vary, so it's always a good idea to check the official Asda website or contact the store directly for the most current information.
9pm
12pm
9pm
12pm
9;30
3:00pm
7
12:00
it closes at 10
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Saturday Night Live runs until late Spring.