Re:
Both Shimano and SRAM (Avid) have designed their v-brakes and caliper brakes in such a way that best way to minimize friction in the front brake is when the cable approach comes from the opposite side, that is, the left lever.
It's fine with me if UK riders use the opposite sides, but this is for example a reason I wouldn't buy bikes (and I also discourage friends) with hydraulic brakes from UK online retailers. A PITA that brakes come in the opposite side to what we're used to, and not so straightforward to correct as with cable brakes.