Collected Hetty on Wednesday evening and have clocked up 500 miles so far.
So far very impressed, handling and comfort are excellent. The ride is pretty good too although she did not like the concrete section of the M42 south of Birmingham (mind you no car I've driven has been at it's best over that section, it really is quite awful).
The Maxidot suggests 58-59 mpg average consumption (country lanes, urban and heavily congested motorways), which for a brand new engine is pretty impressive, 60mpg plus should be achievable once the engine has bedded in.
I've not had a chance to 'play' yet as I've been working ( hence the 500 miles in two days).
I'll update in a week or so by which time I'll have well over 1000 miles on the clock.