Er... no I didn't. I gave a price for work, I gave no price for the value of my car. You don't know any of the variables to know what the value of my car is. Check Autotrader for a rough guage, £1495 and up from what I've just looked at.
You weren't interested in even finding out. The recomendation of most was to just walk away as £20 is too cheap. I fail to see the logic in assuming that paying 150% more per wheel means that you will get a better result. You might, you might not, or you might just get the same result. There is no point in assuming and chucking money away, when at worst for an extra 10% outlay, you can find out for sure. You can then at least provide LOC members with some substantiated info and say yeah, top service for a great price, or steer clear they did a naff job.