Online chat say that the order had not been placed, and as stated in my first post it should take 24 hours to activate. (an added bonus is that you can call mobiles abroad at a reduced rate, from your landline...useful when calling USA, at 6p per minute.) I wonder if with all the activity with BT Plus, the ordering system is overloaded.
So that's stage 2 completed here! Lets hope that stage 3:- Increase the mobile data allowance is simple.