Blinkers were always on the outside when most cars had manual transmissions, the opposite would be very inconvenient (and still is). Then somehow Britain didn't challenge the EU regulation that indicators must be on the left regardless of the driving side. Japanese and Korean cars still supply right-hand indicatored-cars to Japan, Australia and New Zealand, yet left-indicatored to the UK, go figure, European ones don't give a shit, so buyers of BMWs and MBs suffer (or enjoy?) being incompatible with the rest.