So just been out to the car now I've had a chance over the weekend to have a proper nose about.
Everything is connected as well as I could check, oil levels are still around the H mark, coolant was a little low so I topped it up (not sure whether it was always like this, can't remember so I'll keep an eye on it), couldn't smell fuel anywhere around the car while it was sitting.
The other thing I noticed was that the engine bay is covered in metal dust which I'm assuming is from this pulley so the car is officially out of use until the new pulley turns up as I don't want to do any damage.