DO NOT USE MOBILE SITE!!!!
I work in the IT industry and I would highly recommend to stay away from their mobile site! I paid and recieved absolutely no confirmation of my order, then logged on to the main site and did not see my order! It was processed via PayPal, and I also tried via visa previously. Both times there was no confirmation. Also did not receive an immediate email receipt. I had to call in the end and then they confirmed the purchase. Lets hope there are no issues with the fitting of the tyres! However the person at blackcircles that I talked to on the phone was pleasant and reassuring (But I still have no email confirmation or receipt, which is a little worrying).