Haha yeah I know the Vauxhall Garage
. It's really simple Rich,
Head through the tunnel
Just before you come out of the tunnel, take the slip road on the left.
Stay in the far right hand lane.
Go across the roundabout, staying in the right hand lane.
When you start to go right at the roundabout, take the middle lane.
Go straight across, and at the next roundabout, take the third exit.
At the next roundabout(!) go straight across and keep going straight til you see the multi-storey on the right