Not sure if this is too late - or to far East - but a couple more suggestions:
Grasshopper Inn, Westerham - TN16 2EU.
http://www.grasshopperinn.co.uk/
Not the cheapest pub, but really nice and has a huge car park. Quite a lot of events there, so you'd have to consult their calendar before everyone heads down there!
Oxted Inn, Oxted - RH8 9HR.
Cheap pub (its a Weatherspoons), but it backs on to a huge car park for the town shops. Always been very quiet when I've been that way on a Sunday.
Both of these are on/just off the A25, and so are pretty accessible from the motorway or other routes.