Skylark, as the pull out piece of plastic is at the back of the BT Home Hub 3 it's not obvious. I should think the BT help people must get thousands of people ringing them with exactly the same query.
Aww thanks El, still feel a bit stupid though...
No need whatsoever to feel stupid Skylark, it's their fault. I have set up a router from scratch, it is their job to give you full instructions As to having to pull out a piece of plastic from the back to get wifi, it's just idiotic.
Well to be honest i didnt know it was there. I know now!