Ron McDonald, from SNH, said that grey squirrel control would be focussed on the key routes being used by grey squirrels to spread north.

BBC: Battle on to save red squirrels

"We can no longer take red squirrels for granted, like other members of our fauna and flora, they have suffered as the result of the spread of a non-native species - the grey squirrel, " she said.

BBC: Red squirrels conservation plan for Wales