Jonnyboy> How many miles has your car?
I think this is because your car is new...Mine was the same but now at 14.000kms (~9.000miles) the car accelerates on second and third from 1.600rpm
this car has a bit different gearbox rations, so it needs different approach
I think that the first gear is just okay, just don't be afraid and floor it when you need the acceleration. Floor it, wait till the engine gets in revs and release the clutch and the car is very quick even from standstill.
This is matter of new car, third accelarates from 1600rpm
As I read through forum and look on england speed limits with conclusion that sixth is useless, but what I don't understand, why are you worried about that... less gears means less gearchanges and this means less work with the clutch etc = more comfort. I find this cool. 5 gear ratios are enough.
why did you buy it then?
I like this car and I like also because of the un-diesel like power delivery. Normally diesel gears are way too short, second pulls 40mph, third 60-65mph etc... This car goes on second gear 60mph and fourth gear is usable from 38mph till 100mph. This range is common in petrol cars, not in diesels.
When you have bought the car already, try to find the pros in long gearing, not the cons...