"Hall Porter" - Porter at a hotel or "Country House" starts to fit with Elsie Emily working as a Cook.

There was/is a significant Country House not far from Elsie in the 1911 census -

http://getamap.ordnancesurvey.co.uk/getamap/frames.htm?mapAction=gaz&gazName=g&...

Dorneywood House, or 'Lesser Chequers', near Burnham Beeches, Buckinghamshire. Standing in 200 acres of land with 45 rooms, it was left by Lord Courtauld-Thomson to the nation for the use of the prime minister or a minister of the crown. http://en.wikipedia.org/wiki/Dorneywood