You've done everything correctly as far as I can tell, it just seems UKNova have a set time limit which must expire before we get access to the file. I'm no expert however!
'Seeding' means the file is available from your hard-drive for those who downloaded the torrent to access. As more people download from you they will in turn provide access to the file from their hard-drives and the whole download process exponentially increases in speed.
It all depends on the original 'seeders' computer being online however, to start with at least.