Anon,
Was the extra £2.50, because you don't want tv, only quoted to you on the phone? I can not see anything about that on the Sky website. All the "Unlimited" deals seem to involve taking a Sky TV package (from £20 a month.)
Also there is a £30 set-up fee for "Connect" for customers without Sky TV but you are looking at the "Unlimited" product which should be a free set-up, although of course normally taken with a tv package...
However if those prices quoted over the phone are true then it certainly looks like a very good deal for broadband and phone