Not as good as the Littlewoods deal (which I missed, annoyingly) however, it is pretty good compared to whats available out there.
Their price: £57.66
10% off discount code pr8995 = £51.90
+ £2.99 standard delivery = £54.89
note: I've ordered the Large ones (which cost an extra £2 or so) but I have been in contact with them and they notified me that they are no longer in stock. The regular ones are still available.
edit- this deal only applies to the black ones with a specific lense as the other colours vary in price