Replaced back box. Picked up last MOT as the outer was rusted and coming away. Not blowing. See the pic of the old one below. Looks suspiciously like a date code, if it is, it’s done very well. My FL is a March 06 registration on 157.5 k miles...

No worries. Been there done that lol

There's one that runs across the front, at the bottom of the engine just below radiator. That's the intercooler hose. You should see in going into cooler on drivers side.

Looking at the front of the engine you will see two rubber hoses with a plastic section between them. Check those.