I’m a UK 7.5 , sometime I take a 7 , sometimes an 8 depending on what I’m buying and whether I can get the half size or not. and I was happy with an 8 but only after I put some insoles in . I too heard that you need to go up a size but the 8 seemed ok / big, I did try a 7 but wasn’t happy and felt that they would be too small with thick winter socks.
Mine are the Adventure low.