We all know you can negotiate great discounts with Telewest if you're an existing customer but unfortunately they've only had set prices for new customers that wasn't too great but now they have a new offer.
You can now sign up for 10MB broadband for only £27.00 for the first year and not only that, they normally charge you £25 for installation unless you add an additional service but because of a flaw in the system, you'll be able to get installation for free of charge.
They also offer you a £10 discount for each and every additional service you agree upon, so if you add a phone line or tv package, you'll receive an additional £10 discount for each service which will be deducted from your first bill, which i would recommend getting a basic phoneline package, which entitles you to free basic tv package.
Here is the details of the £10 off for every new service:http://www.telewest.co.uk/html/specialoffers/general_web_discount.html?AID=10376865&PID=1699685&SID=64064
Not only that but if you sign up through Quidco, you'll also receive £40.00 cashback as well, making it the best package for new customers i've managed to find.
Remember, this is a 1 year price but at the end of the year contract, make sure to call them and demand to cancel and they'll reduce your price even further than ever before.