Out of interest did the garage turn up to the court hearing? If so what defence did they offer?
Yes, they turned up. I actually felt slightly sorry for them at the start, because after the judge read my complaint and I confirmed it was correct, he turned to the dealers side and said (and I'm paraphrasing because I can't remember the exact words) ' I have read your defence and I can't say I'm particularly impressed. Did you seek legal advice?'.
They contended that the hole in the piston was caused by extended overheating and that there must have been signs of overheating prior to the breakdown which we had ignored and that by continuing to drive the car in that state rather than taking it back to them, we worsened the damage. The judge took the view that even if that were the case (And it wasn't) it would demonstrate a clear fault with the car anyway, so it would still be their responsibility. He also observed that it would be for them to prove that was the case, not for me to prove it wasn't.
During the initial discussions with them, when they were asking questions about what had happened, they asked if I had been checking the oil. I told them that I checked it every couple of weeks (As most do). They argued that the manual says 'once a week or when you fuel up, whichever is sooner' and because I failed to do that, I was not properly maintaining the vehicle. They also suggested that if I had checked it in line with the manual, I would have noticed it losing oil and could have taken it back to them for repair. The judge took the view that if a car that is losing that much oil that it needs weekly checking, then it has a major fault, which again, is their responsibility and the fact that I wasn't checking exactly in line with the handbook wasn't relevant.
All in all, the Judge seemed quite clued up on mechanics - for example, I had planned to counter their argument about not checking the oil that, if it had been losing it at a high rate, I would have either seen puddles or smoke, but he actually stepped in and pointed out exactly that himself.
I didn't actually do much talking in the end. He read the version of events as he understood it, which I confirmed. Towards the end, he asked why my wife wasn't present (She was driving at the time it died) and I explained she was abroad at the moment and gave her version of events. He briefly considered putting the case on hold until she was back, but concluded that she was unlikely to say anything I hadn't already said. Beyond that, almost all of the talking was between the Judge and the dealer on the above subjects.
Congrats on seeing this though to the end mate, the best man won in the end, even if it did take 6 months. I guess you'll have to wait and see what they decide to do, whether it's repair the car or just give you a full refund
Thanks

Actually, thats no longer up to them. When I first took the car to them they could have either repaired or refunded, but because they did neither and I took it to court, it became a specific petition for a refund. In giving his judgement, he said to the dealer (and I'm paraphrasing again) 'The car is now your property, you owe Mr Linkex £xxxx. Mr Linkex, you must do whatever paperwork goes along with returning ownership to them (i.e. the V5)'. And with that, we were invited to leave, so I thanked him and left.
One final note, and something that only occurred to me today, but presumably this means the dealer now have a CCJ against them? Is that something you can search for? (Credit check?) It seems to me it might be a good way to tell how well a dealer treats its customers in this situation, so if you're about to buy a car, maybe chucking £5 at Experian could be a useful investment alongside the HPI?