I might be wrong but it looks as though Kenny Ball is with Norman Field and Derek Bennett of the Zenith Hot Stompers.Viv,
An interesting set of pictures and good news that they are online. Not being involved in trad and being quite a few years after I left Brum, apart from the three guests - Bud Freeman, Humphrey Lyttleton & Kenny Ball - the only one I know on there is Sleepy Reid, who was the former bass player with Andy Hamilton & the Blue Notes. I guess that Sleepy was depping for someone as trad was not his normal scene either. He did a few wedding gigs with us in the late 1950s.
In all the time I knew him, Sleepy never had his own transport and rarely did fellow musicians have a vehicle big enough to take him and his bass, so he used the BCT buses, which unless crowded, generally had space beneath the stairs to take his bass and he never had problems in those days. I'm not what the situation would be today. If his gig finished late, he would simply leave his bass at the venue and go back and collect it the next day.
The last time I bumped into Kenny Ball was in Swindon in the early 2000s when Jan & I went to see the Big Chris Barber Band and he was guesting with them, but not in good health. I'm pleased to see that Chris is still alive and kicking at the age of 90, though no longer playing. Thanks for posting that link.