It’s worth remembering this was for the circa 1978 EPCOT, not the 1979 version.Disney and More posted an article on a never built UK Pavillon ride at Epcot, it would have been a boat ride on the River Thames where you go past London Landmarks!
This would have made a cool ride
http://disneyandmore.blogspot.co.uk/2017/11/harper-goff-lost-london-boat-ride-for.html?m=1
The version that was built was originally to get a vaudeville theatre as phase two.