UK network giffgaff has commenced sales of the Huawei P9 with Leica-certified optics. Ready for purchase online, the unlocked smartphone can be bought for £369. (That's considerably less than the usual £450 asking price.) Since giffgaff does not deal with contracts, you'll need to pick up a PAYG SIM that will provide you with the required amount of data.
If you're unable to fork out for the handset outright, giffgaff has financing options available with the Huawei P9, which set you back a more manageable £17.06 per month for 2 years, with an upfront fee of £25. The carrier has the P9 listed in titanium gray.