I think it's worth pointing out that although the station cafe at Wymondham markets itself as "The Brief Encounter Tea Rooms" or some such, Wymondham was not the location used in the film, which was made at Carnforth station in Lancashire, and in any case the buffet never really existed -
from:
http://members.fortunecity.com/carnforthstation/friends/chronicle/chro nicle16/chronicle16.htm -
"David Lean wasn't happy with the real location of the refreshment room at Carnforth Station. He considered it to be too far from the subway for him to be able to easily get the characters to and from the refreshment room. L.P.Williams, the art director, was consulted, and 'flats' were constructed in Denham Film Studios and transported to Carnforth by lorry. These 'flats' were then erected on to the north of the subway, on the centre platform. Although in the film both sides of the refreshment room can be seen, there were actually only two 'flats' made and these were moved on the station as necessary, so that the refreshment room appeared to have depth. All the interior shots were filmed at Denham Film Studios."