Iainfm - thanks
Yes, sorry, forgot the basics...its a 147 1.6 petrol
I might disconnect the MAF this weekend and see how i get on, as its obviously the best starting point as its free and easy!
Smaky - thanks for the reply too. To be honest im not sure if Autolusso tested the lambda sensors stone cold or white hot...i'd only be guessing.
This said, i had the same prob last summer and replaced a lambda sensor, which cured the prob for a few months...that in mind, it could well be another lambda, or the replacement one (i replaced it with an aftermarket one, Bosch i think)
Appreciating this help so far anyway!