Default D802 o2 4G confusion

Hi guy's

I recently bought an unlocked G2 D802 and want to use it on o2 UK's 4G. I've tried most euro firmware (KitKat variants A B & C) and tweaked with the hidden menus with no joy

Upon doing research it looks like o2 UK use the 800 MHz frequency, which I believe the G2 doesn't support

Anyhow looking at the o2 website, they sell the G2 there claiming it to be 4G so I'm assuming it should work on their network?

I'm confused Haha

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