I have just placed an order with Tyreleader for 4 MPSS, hopefully I will receive them ok, I will keep you up to date.
One warning - I called the fitter mentioned on their website to check the fitting price, it was slightly out, but only by 50p per tyre. It is worth mentioning that the fitter didn't know anything about Tyreleader and had received several sets of tyres over the past weeks with no information on who they were for....
So if you do order and get them delivered to one of their named fitters it is worth giving them a call and providing them with contact information, etc.