Thanks for the welcome...
Compression seems fine. Pulls like a tractor, no smoke or oil useage. Valves need adjusting and I removed the sparkplug that looked like it hadn't been touched in over a decade (hardly any electrode left).
It's missing all the skid plates except the one on the front and I'm slowly discovering other issues, but apart from these things, it's an honest machine and they're hard to find second-hand over here. Market is flooded with cheap chinese crap - anything japanese holds its value and second hand bikes are sold privately within minutes of being advertised for sale.
So my wish list for now comprises left hand floor-board, belly skid plate and rear diff skid plate. Would appreciate any pointers. I've checked out fleabay both here and in the US and there doesn't seem to be much on offer sadly.