Where could this be? solved by biggusdickusgb

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A40

Sorry daf mad

clue: This was once a dual carriageway a long time ago

Old A74?

sorry mate further south.

another clue the are some funny stones on your left just around the bend

this bypasses a town and there is 3 roundabouts on this road.

Focus on the Grey building

Funny stones? A303 Near Amesbury?

The stones look like stones from stone henge but i think they are called something like devil stones not too sure.

clue 2 there is a merc garage about 2km away.
clue 3 I have been here before but on a different road.

A168 boroughbridge, the old A1
the big grey building is Reed Bordall

spot on mate