Most modern cars can go quite a distance before needing engine work, but as your motor gets older, you might spot a drop in performance. That’s usually down to soot build-up — a normal result of burning fuel — and it tends to affect diesel engines more noticeably.

Simons’s Garage offers a carbon cleaning service that uses specialist kit to reach the fuel system without taking the engine apart. It’s a cleaner, quicker solution compared to the old-school approach of scraping off carbon by hand.