I don't know how many people are aware of this, but a sink hole was found in Summer Hill Chislehurst, (I guess right over the caves), and traffic has been diverted through Petts Wood. I gave up trying to get to St Pauls Cray via Petts Wood yesterday, but on the way back decided to try it in the opposite direction, and at 6.45 pm the traffic was still dire through Tudor way.
So give yourself some extra time to get to the meeting.
Carole
Please also note that the main talk of the evening will be the first item on the programme, as the speaker needs to get home promptly after it.
http://www.orpington-astronomy.org.uk/events/2017-june/