Thanks guys,
No I didn't log out and I have also tried using Opera as well as Firefox with the same results.
As I have said all other secure transaction on other sites are fine.
As an example I just went to the T mobile site,added a phone to basket,proceeded to check out and straight away it was secure,BEFORE I had even put in any personal details or created an account.
Edit,just tried IE8 as well,and none of the site was secure using that....I tried the T Mobile site again,and as soon as It went to ask for personal details,it was secure.
Edit 2.....I have ordered via the telephone to be on the safe side.