On charters a despatcher would usually either fly with the aircraft or be positioned at the charter destination
We wish!
L&B was done by the flt crew on charters; if the flight had a
PR flt crew member on board it was his job, otherwise it was the NHP's. (Unless the Captain was the NHP when it became the SFO's job.....)
At some BA stations arrangements might be made to get a L&B through company, but generally for charter flights we operated the way charter companies did!
Edit: Actually, I now recall we did sometimes get a dispatcher sent to UK stations occasionally. No big deal, either way - you just got on with it.