Cheers all for your help. Thanks to a very helpful Billy B in the ticket office, problem now sorted, by sending me a link to download my season ticket afresh..
I've deleted single tickets from my Apple Wallet before without the entire app disappearing, but since Liverpool was the only one...
Only the Liverpool ticket was showing, so I clicked Remove Pass, expecting that only that ticket would be erased.
Instead, the Albion Pass image disappeared completely!
So, guessing I now need to re-install my Apple wallet/Albion pass. And then, somehow, get the Spurs ticket showing on my...