I'd take the tyres back to the suppliers/fitters and ask that they be returned to the manufacturers. They could be part of a faulty batch. Only way is to seek a response from the manufacturers and the best way to get that done is to go via your suppliers/fitters. I take it they were supplied by a reputable company and were for the UK market (some cheaper tyres have been imported into the UK and were not meant for this country), so check the rating and manufacturing codes.
However, if both tyres have worn on the inside, it may be that your front tracking is out, sounds like you have too much toe in in your settings if both have worn in this way. Driving over obstacles like speed humps and sleeping policemen can put the settings out, especially if you straddle these (you should drive straight over them, in the middle, alternating between searside and offside wheels and at a S...L...O...W speed. Suspension bushes can also fail because of these raodside hazards (bollocks to traffic calming

). Get the tracking/wheel alignment checked before fitting new tyres - a 4 wheel alignment would be best.
Put your new tyres on the rear, not the front.
As for Dunlop Sport Maxx - had them factory fitted on my old GTI - did 15800 miles without any wet/dry issues and they had plenty tread left when I sold it. Better tyres out there, yes, but they ain't that bad.
Cass