Looks like late '80s era judging by Professor Treacle's hair colour (Great Outdoors/Hopeful Starlet). I don't think that scene's in the UMD Store currently but it's undoubtedly in the WSM member site.
These are images from set S061 shot August 1989. Not often WSM set up a shoot, complete it, yet junk the video! So no WSM movie exists of this shoot. But a very nasty windy squall arrived and clothes and foodstuffs got blown everywhere! Although the images were culled, 66 survived and you can find them on our Standard Subscription site, page 13 under Slapstick Image Galleries on our website www.wsmprod.com Not the best idea to do a shoot on a river bank.....far too exposed! But enjoy those pics! Mike Ellison WSM Productions