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Well, we both went and all is well.
I was given a slot of between 8am and 3pm amd was waiting for my email to say my order was ready to collect. No email appeared, so we trundled off in the car to collect it anyway or to speak to someone there if we couldn't. Nobody paid any attention to us on the drive there....no officious policemen.
When we got to Asda, the Click and Collect place was deserted, so I put in my order number, opened the boxes and lordalex put it all in the boot. No human contact at all.
Looked up my order when we got home and saw that it was still showing " preparing for collection" or whatever phrase they use .
Will know again just to take the chance and go when we want to rather than waiting for them to email.
Difficult times for them , I know and the service is very convenient so I shouldn't grumble.
Thanks to everyone who responded.
:-))