Dunno?
I paid just over £400 but I have 17's
I don't know if michelin are still doing the 25% off of you buy 4 tyres offer.
Basically when I got mine from ATS Euromaster Michelin had an offer where if you bought 4 tyres you got 25% off so basically paid for 3.
If you have 18's, which having an ED30 I would say you do, then you are prob looking around the £500 mark.
Best bet is to ring round and play people off against each other. Also try camskill as you may be able to get 4 tyres delivered and then pay someone local to fit them which could work out cheaper.