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

Only 12 bottles have been made and each comes with its own certificate and is presented in a stuffed stoat or grey squirrel.

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"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