Thank you for your swift reply, but sadly it didn’t work for me. I force a re-check on the copied (bad) file and it just carries on as if new download.
Sadly, it looks as if I’ll have to use another distro, this is taking too much time up. Bit Torrent is horrendously sloooow.
I suppose it is too late now but just in case you haven’t moved on already. The bit torrent client will still download but just the chunks with a bad checksum if you look in the relavent menu that shows what is to download ,usually in the form of a stripped bar. This should show what is to be downloaded, I have noticed that the client does not always accurately reflect this new state on the front page. It does work with Ktorrent and is a very useful technique.