Lowa boots size?

[faca]

Hello, please don´t laught. I know many people here use Lowa military boots.
I need your advised about the correct UK size for a pair of Lowa military or mountain boots.
My bare foot (without socks) is 26.3cm right or left.
Links to buy them as cheap as possible.
Thanks in advance for your attention.
Enjoy.

[Raz]

I bought a pair of 305's, as my foot is exactly 30.5cm long.
However, I found my toes bang into the front on a downhill. So I have just returned them for a size 315, which apprantly is a UK15. Which I find hard to belive, as I normaly where a UK13.