On VFR days, I tend to stick Stapleford on box two just for a little aerodrome awareness, but I'm with IO540 inasmuchas once above their ATZ - and working Farnborough for a traffic service - there isn't much that Stapleford can usefully tell me. On the occasions that I have called, the FISO has invariably sounded rather put out that anyone should waste his time by calling up, when the most info that he can give me is the local QNH.
On IFR days, I wouldn't bother to even put them on box2.