I've cleaned the chain, adjusted it & half fitted the loobman, I think I've done it right. I'm never 100% sure I've done anything quite right.
Before I finish it off tomorrow I thought it's best to lube up the chain and sprocket but rather than use the last of my spray can, I went with the 10w40 I thankfully had lying around. I can now see the issue of fling and have a puddle of the the stuff dripping but the chain looks really clean and I can imagine a steady stream of that stuff every ride will hopefully mean I don't have to clean it for a long time.
God If it had been £3 quid then no issue. Never understood why it was an optional extra anyway. I think it was about £40 quid at the time. They're about £25 quid now but I remember being really put off by what seemed like an excessively high price for something I wasn't 100% sure about.