Changed oil and oil filter... when I took the sump plug off, a bit of silicon fell off that had obviously been put on to stop any leaking... at the time - because it was so thin - I just ignored it. I put the plug back on and it was leaking... so annoying. Went to town and got a sump plug washer (thanks for the advice Chris) from Super Cheap (MALZ didn't have them...). It was still leaking (slowly) with the washer on, but I had already put 1.5L of the new oil in (to check for leaks)... so I had to drop that oil, put some gasket goo on the washer and chuck it back in. It leaked like a drop and I think it's stopped. The plug was tightened well the whole time though...
Here are some pictures of the exhaust and random others: