Two months on, and the car is running fine on E5 petrol.
No-one else has reported similar problems, so maybe I was just unlucky with slightly contaminated fuel? (Tesco)
Thank you gents for your posts.
Steve
I own a 1.4 TFSI Q3 and have using E10 fuel since it was introduced. However, a warning light (engine symbol) has recently displayed. I took the car to a local garage, and he said the engine is running ‘lean’ due to the newer E10 fuel, and I should revert to using E5 Super Unleaded fuel.
Has anyone else had similar problems?