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Well I replaced the seal today and so far so good. Apart from being a bit of a faff to get the old one out it went pretty well. Shaft looked ok too so I greased the new seal up and knocked it in square with a socket. I'll see how it goes when it's warmed up as that's when it seems to drop the most oil but for now I'm happy. Thanks everyone for your help so far

Yeah, it's only a cover... But before messing with anything, I'd clean it well and try and find where any leak is coming from. Might not be the box. I'd be tempted to pull it out and have a good look through everything. Worst thing about removing boxes is the the half shafts. Everything else is easy/straight forward. Edit- just realised we're talking about the 6 spd box... The cover is different (magnesium not pressed steel) and holds two bearings in place. When you pull it off, you need to ensure you don't twist it diagonally- it needs to come straight off so the bearings don't get damaged. Easier when warmed up a bit. Also the most common place for a leak on vdub boxes is the output flange seals (next to the diff).

Yes - you have found the fill and drain - heres a clearer view of the fill point: I filled mine with the box out of the Lupo, its 1.9 for 5 speed and a very annoying 2.1 litres for 6 speed Make sure the fill can undo before doing the drain