Dribble from the front crank seal on the SD1 has changed into a flood. Did change the seal not that long ago, and noticed the pulley assembly had a deep groove where the seal rubs. So the new seal didn't work for long. New assemblies NLA, and used ones likely worn too - if you can find one for my particular engine with A/C.
So have ordered up a Speedi-Sleeve from SKF bearings. There are lots and lots of sizes and finding the correct one took ages - out of stock at the UK main dealer.
Eventually found it at Simply Bearings for £33.
Will update how I get on when it arrives. ;-)