It was at Edmonton Green Shopping Centre in north london. The ramp was the crossing over the big roundabout they have there. Edmonton Shopping Centre is basically made entirely of concrete and is quite retro in design. Its being done up at the moment so whether that over pass will still be there in years to come is doubtful. The entire route of his skating expedition took him over to Lea Valley Leisure Centre (now closed). All this useless knowledge is sad I know, but having lived in the area all my life, you just get to know!