'Tee Hee' is my rendering of a 'Snicker' and a Snickers chocolate bar in the UK used to be called a?
One was allocated to RAE Farnborough and used on the Farnborough - Westcott - Bedford ferry service (occasionally stopping at Twinwoods Farm rather than Bedford itself.)
I was told that with a full load of passengers it could not climb very high and that the passengers hated it in winter as there was no heating.