Hi ksand24 and robinsnc,
Thanks so much for your replies.
I managed to call the bank and the person I spoke with was very sympathetic, and is resending the official paper statements for the (huge!) missing period. Hopefully they'll arrive in the next couple of weeks, they said.
I also managed to get the paper statements re-enabled so I'm *hoping* that normal service will be resumed from next month and my panic has settled down!
From here on out I'm going to be running stock control on my bank statements - a good idea about checking when paying credit card bills. As we use that for day-to-day spending and clear the balance each month that's probably the smart choice
Thanks again, and have a lovely day folks.