Agreeing with Nicky J here. as the exchange has only recently been upgraded and with the comparatively small size I wouldn't expect any congestion problems.
Re the deals on signup the maximum on Sky is £50 M&S Vouchers,however go via Topcashback and you can claim £50.50 broadband only up to £90.90 with New Customer - Sky+ HD Box with HD Subscription + Broadband Unlimited.
Notes on Topcashback: See the bottom line for best deal
Cashback will not be paid on any purchases using an offer code.
Cashback is only for NEW customers only, unless stated otherwise.
Orders must be completed WHOLLY online, if the order is finalised over the phone, the order will not be eligible for cashback.
Please note the maximum M&S voucher amount that can be received in conjunction with a cash back claim is £50.
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Sky Broadband Unlimited LLU without TV