Moto X Style vs. Pure UK LTE Band Compatibility

I'm considering picking up a Moto X Pure whilst on my travels to the US in a month's time, but will I be missing out given that the US model doesn't support 800MHz (Band 20) LTE? I intend to use the phone in the UK on Three who use 1800MHz (Band 3) and are now introducing 800MHz to improve indoor signal strength.

Buying in the US saves nearly £100 compared to the UK retail price, though I have noted that Clove and Handtec are offering preorders for slightly less than Moto direct...