Clarkson, James May and Richard Hammond revved up with caravans in the Highlands yesterday – complete with a coronavirus testing centre.They were at picturesque Glentruim filming their show despite heavy downpours.The area is the geographic centre of Scotland and the trio filmed about half a mile from the stone that marks the spot.They arrived on the Glentruim Estate in 70s American cars towing caravans.The group also had some American and Russian cars which they raced around a field.The crew