I realise this is a bit sensitive, but does anyone know of a good way to download torrents, audio & video, solely using an iPad?
not an easy way, no.
(But if you have a synology somewhere you can download to that?)
There are torrent cloud services like bitport.io and seedr.cc, some of which have limited free tiers, in which you paste the torrent file, they do the downloading to their service, and you download at your convenience. I don’t have one of these accounts but I know people who do.
Here’s an article from a couple of years ago about Seedr: