Today we siphoned the wine out of the jug into a bucket so that we could clean out the sediment and bottle it up again for another 4 weeks.
I added more sugar and one of the crushed Camden tablets, then we poured it back into the clean demijohn and put it in a cool place to wait. It's going to take some time.
John and I both took a quick sip, and it was VERY tannic, and a bit bitter. I read up on it and that seems to be exactly what others have experienced, but that with more time and the sugar, it should come out okay.