Whilst I can't help with your query, I got an email today from topcashback.co.uk and there are some rather large cashback offers available on various packages. It's worth taking a look before going direct go bt.com
No at the time of checkout you just pay one off charges the monthly charges come off via direct debit or billed. Make sure you go via Quidco or Topcash
BT Infinity 2 Broadband
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My one off fees (postage for the hh5) was added to the first bill. Whilst shopping around I saw a n ISP wanting to charge over £80 in one off charges and that's without any sweetener to get cash back or shopping vouchers.
Steve
My internet providers
BT Dial Up 56k
Nildram 2/1
Newnet 2/1
O2 17/2
Plusnet Fibre
BT Infinity 2