Glamour photographer Tommy Sanders, played by Derek Aylward, is based on Mayfair magazine's Philip O. Stearns. The photo-shoot scene was filmed at Stearn's own studio, and stills appeared in Mayfair in July 1970 (issue 05/7).
The couple board a Hastings line narrow bodied DEMU (diesel electric multiple unit) train at Etchingham bound for London Charing Cross; have sex on a 4-COR EMU which operated between London Waterloo and Portsmouth, and arrive at London Paddington. They say they came from Oakham (in Rutland) so would have come into London St Pancras or London King's Cross.