Regarding the Val Wilmer story mentioned by Chris A., I wonder if this could have happened during the 'JATP' tour of the UK back in either 1964 or 65, one of the concerts of which the BBC filmed for 'Jazz 625'. T-Bone has a featured solo set at this concert and Dizzy was nominal lead of the main lineup (which had Zoot Sims, Clark Terry and James Moody if my memory is correct). I think it was filmed either at Kilburn or Shepherds Bush Empire in London, I'll have to check.
Disturbing indeed..