Dubarry boots sizing?

[TheLightGetsIn]

Eyeing a pair of Dubarry ankle boots but I'm usually a half size and they don't do half sizes so unsure whether to size up or down. Does anyone know how they come up size-wise?

I find the Galway and Roscommon styles small fitting length wise but standard width wise. It may depend on the style though - I haven't tried any others. I have to size down as they're too cumbersome when sized up.