"John Rowland" wrote

To arrive at Heathrow, and be met by your own canal barge,
seems like a neat service to offer frazzled foreign tourists.

Where is the navigable waterway at Heathrow?

It's the Grand Union Canal, close to the railway. I regret that I
can't remember the name of the car park organization. It's been some
time since I left my car at Heathrow when on a trip, and I can't find
the leaflet.

Jeremy Parker