To at least expect a call to say my shopping is going to be late!

[Awomansworth]

Just that really... should have been delivered between 4-6, just rang them only to be told that "oh yeah, flat tyre, running two hours late.

They have 3 contant numbers and an email address FFS.

Have you called them? They'll often give you a voucher for this kind of stuff. It's frustrating though. Especially if you need the shopping for that evening's meal. YANBU