Now that Scottish Fuels have taken over Brogans Fuels will the prices rise in the Highlands and Islands again?

Here in Lewis when Brogans started coming onto the island, Scottish Fuels cut their prices immediately by 4p a litre for domestic heating oil. Now Scottish Fuels have the monopoly will the prices rise by the same amount again or will it rise further due to lack of competition on the islands?

In Caithness and Sutherland you have the ability to shop around for fuel supplies.