Indeed. It has changed beyond all recognition since the film was made (I have frequented it since the 70s, but rarely nowadays). It is a very long walk from East Horsley as the nearest station is Effingham Junction and that is a mile and a half away! Sadly other 'interesting' pubs in the area have been demolished, notably the Dukes Head in Walton (Psychomania) and the Star in Hersham (home of Sham 69).
If you are looking for film-related pubs in East London, I believe the Royal Oak featured in Lock Stock and 2 Smoking Barrels.