Basically, after speaking to my contact in O2, the 6 Plus is physically the size of a Samsung Note, the 6 the size of a Galaxy S5.
So that puts the 6 Plus out of the running for me.
What I was suprised about is why they didn't drop the 16GB models in favour of 32GB models rather than the other way round.
16GB is too small for today's standards.
Already have one set aside by my friend at O2, factory unlocked, so I don't have to rush and can just leisurely walk in and pick it up