Thanks guys!

The Ten just had its first fill-up after picking it up from the dealer, averaged:

44.1 (Imperial) MPG, or 15.6 km/l

This is excellent, as operating conditions are harsh - runs to work in heavy London traffic + the engine is just starting to break in, and I've put in 15/40 mineral oil after first 20 miles. (I am using the 'mototune' break in method after experience proved it to be effective)

Given this, a couple of months down the line on decent oil I would realistically expect 55+ mpg.

Tyres - came with Michelin Siracs. Excellent on road so far, and get really hot very quickly. Hope they can put up with the heat cycles : !