UK consumers are protected by the Sale of Goods Act for a period of six years. But the retailer is culpable rather than the manufacturer so you need to approach the company that sold you the device.

In the first six months from the purchase date, when you return goods to request a repair or replacement, you don't have to prove that the goods were faulty at the time of sale. There is an assumption that the goods were faulty unless it cane be proved otherwise by the trader. If you choose to ask for a refund rather than a repair or replacement, the onus remains on you to prove that the goods were faulty at the time of sale.

I am not a lawyer so the above comments are only an informed opinion, they do not constitute legal advice. Google will provide you with more information but here is a BBC article which may help.

http://news.bbc.co.uk/1/hi/8253915.stm

BTW I just completed a trip across Europe during which my N900 failed to charge (the device said "charging" but didn't), switched timezone incorrectly, and failed to provide any useful GPS guidance. My wife's Nexus One behaved flawlessly throughout. I would very much like to return my N900 even though the power socket hasn't fallen out yet.