Thanks for the part numbers your the first one that came up with actual part numbers!
I see about the consumption but what speed where you doing on the motorway and also B roads?
No motorway driving just rural single carriage way roads. Most of its on my 12 mile commute to work and back, up the Yorkshire wolds. The trip says I average 35mpg there and coming home I averaged 46mpg. Usually it's about 60-70mph, obviously 30mph through the villages.
Have you got an uprated clutch?