They're a Dunlop, and can be acquired by most places.

Demon Tweeks do them, as do M and P. (www.demon-tweeks.co.uk and www.mandp.co.uk )

£150 a set last time I bought them, and as Andy mentions, the SP are the softer compound.

Look here: http://www.dunloptyres.co.uk/bike/ for details. Click Radial Tyres top left, then click GPR70 at the bottom of the page.
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