I thought the 18" inch size was 235 40x18. Probably isn't much to find that's cheap. It would make the most sense to get the same brand and model as the rear tires. Do you do tire rotations?
I used www.blackcircles.com. You buy the tyres from them and they deliver them to your local garage for fitting. They offer a 'supply only' or 'fully fitted' price.
I also had the Dunlops from new and don't rate them at all. I went for the Continental Sport Contact 3 a couple of months ago, and got a front pair fitted for a smidge over £300.
Got my last pair of rears from Quik fit, they are bridgestones or continentals, 235/40/R18's and were £300 fitted. They have a deal on at the mo if you buy 2 or 4.
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