Thank you all guys.
Daley, I read the topic about the group buy, the problem is that I can know my days off just one week before so, for instance, I can't get an appointment now for February. My idea is to get new parts and then give Jez or SVM a call. By the way 400 quid to remap a car like our 350z it's really cheap, in South Italy (where I lived) I used to ask 500 euros to remap an old EDC15, in the North of the country prices were and still are higher than mine...
Ok, I'll keep you posted. Cheers!