Hey Simon, thanks for picking up this topic. Have you seen this thread, which also asked about adding the ability to tag transactions as subscriptions/reoccurring:
It includes some quotes from Hugo and Tom that both indicate possible development in this area, but it would be great to get a response as to whether or not this is functionality that is planned at some point. Personally I would find it extremely useful, as card ‘subscriptions’ cover a similar use case to direct debits, so just seeing direct debits doesn’t provide a full overview of my monthly outgoings.