Well it sat at the garage for 2 and a half weeks, the guy couldn't find a replacement engine for a decent price. Told him to give us a quote to fix the leak which took another few days for them to come back and say they don't want to touch it.
@gookah and I went to collect it a few days later to find they had filled the system back up with water so we drove it back and it didn't lose a lot. A tub of K-Seal was added to the system which fixed the leak for a couple of days and we took the spark plugs out and closed the gap which got rid of the judder about 90% of the time. Then the system started leaking again so I put some Radweld plus in it which seemed to stop the leak completely. The engine did sound a bit rough but it was driving loads better and wasn't leaking.
It needed some money spending on it to fix the judder which was most likely spark plugs or a coil pack, it had am oil leak and would need a new water pump in the near future. There were a few other things that needed doing before the next MOT so the decision was made to get rid whilst it runs well. It cleaned up real nice and looked smart, it was actually quite sad seeing it go yesterday and it drove great on the way to the pick up the new one. It got traded in against for this.
Its a nice little car with loads of stuff like cruise control, bluetooth, start-stop, reverse sensors, auto wipers, auto mirrors and free road tax. All stuff the Mini didn't have. Just waiting for a call to say 'I've filled it up with petrol instead of diesel'