Bank Feeds and HSBC - How far back?

We've just migrated from an old version of Sage and are about to start reconciling the bank accounts from 1-Oct-18. We'd like to use the Bank Feeds feature for this, but it seems that it's only downloading transactions from December and not before then.

Does anyone know if there's a restriction on how far back you can ask it to download transactions for? We bank with HSBC, if that makes a difference.