Hi Mark
This isn’t an option at the moment. Generally a money isn’t considered yours until it’s confirmed by GoCardless, so it’s a bit tricky. Until that point, it could be cancelled or rejected.
There is a feature request topic for this, you may wish to take a look at. There’s also a link there which explains this in a bit more detail:
http://community.quickfile.co.uk/t/auto-disable-reminders-when-direct-debit-is-present/10018