So I'm currently in Indonesia and Xiaomi are officially on sale here, they are the best VFM option here.
I'm looking at (all local prices converted to GB£):
Redmi Note 4X 3GB/32GB Snapdragon £105 (IMX258 1/3.06" f/2.0)
Redmi Note 4 3GB/32GB Snapdragon £108 (IMX258 1/3.06" f/2.0)
Mi5C 3GB/64GB £150 (OV12870 1/2.9" f/2.2)
Mi5 3GB/64GB £175 (IMX298 1/2.8" 4-axis OIS f/2.0)
Mi5s 3GB/64GB £200 (IMX378 1/2.3" f/2.0)
Mi5s Plus 4GB/64GB £222 (dual IMX258 1/3.06")
It looks like Mi5 or Mi5s is the way to go, but maybe there is a better deal on a different brand in the UK?