I am keen to buy the Sony A7S Mark III camera. It costs GBP 3,799 in the UK.

Yet the same camera sells for USD 3,499 which converts to £2,640. And in Hong Kong the retail price is HKD 27,000 which converts to £2,668.

A difference between the UK and US/HK of more than £1,100 for the same camera! Why is it so much more expensive in the UK?