Wow, that's awful
Is the wear uniform, or at one edge indicating tracking wrong? More understandable if that is the case.
I have Michelin Energy Savers on my new last June Mk3.
Apparently (I've not seen it yet) both tyres are symmetrical and the wear is slightly worse on the outer edges (3.5mm v 4mm down the middle). Of course that's still above legal but it's worse than I would expect. I usually change them at the end of summer when they get to around 3mm so that I go into winter with maximum depth.
If it was mostly the outer edge of the nearside tyre I could blame it on roundabouts and maybe going round bends (I don't speed round them but I know what my car can do and if conditions and visibility allow that's what I drive at).
From looking online the Dunlop SP2030 does broadly get good reviews but some of them do call out poor wear. It sounds like I have a couple of months to decide but I'm not going to get through Summer on them
Looking at general tyre prices they are around £90 a tyre with some at £70 (hmmmm) and others at £120 (hmmm?). What's odd is that there doesn't seem to be much choice. I know my last pre-reg Jazz had silly half profile tyres on it but what's so special about 185/55/R16?