Connection dates

I have had a letter from TalkTalk giving my connection date as the 12th of june, my Mac from my previous ISP runs out on the 13th of june, if for some reason i don't get connected on the 12th will i need a new Mac, or does the fact that i've been given a connection date mean that TalkTalk have already submitted my Mac to BTW.

The go live date you have been given will have been what BT returned to talktalk after submission of your order. The only reason you would neede a mac code now is if your order is rejected by BT further down the line

Thanks for that theres only a week to go before migration so hopefully that wont happen, thanks for that and all your help in the past.