Deal is via Phones4U on Vodafone as an upgrade to an existing contract, make sure to ask for the £34 a month deal with unlimited minutes as they don't advertise it.

Sony Xperia Z for free
Unlimited Minutes
Unlimited Texts
2GB of Data
Free MDR1R Headphones worth £179.99 (Amazon.co.uk - if you dont want them flog them on ebay)
£34 a month

Downside is it's a 24 month contract.

All in all, its a great deal.