Sundays is always a busy day for currys due to some people who can't get there in the week, they will attend to customer click and collecting before taking calls.
Our Currys has been open throughout the lockdown and was all last year too. It's always a good idea to at least look and choose off their website as they don't usually keep much stock on site.
14.54 A real shot in the dark, but it worked for me. Pull out the main plug in the wall., Leave out for about 5 mins, plug back in, then with the power button on the washer, turn off and on in quick succession about 5 times. This can sometimes reset the electrics.