Does anyone know a supplier of 3mm bore pink tint pipe ? Only been able find one Bay but only in 5 mtr lengths 

Try Yambits Alan?

https://yambits.co.uk/air-intake-fuel-system-fuel-oil-line-parts-c-241_97_45_908.html

I did buy the recommended part from Yambits but the 4mm bore is to big. 3mm works okay. Maybe I can ring them to see if they have the correct listing ?

Found a couple of suppliers on Bay in the end. Another small job done !