The definition might contain a misprint.19a) Group interested in birth of river boat (4) r?o?.
20d)/Traveller wanting public transport finds new port (6) ?ol?mn
Danny, I forgot to say - this puzzle had one abbreviation, 19 A was it - Royal College of Obstetricians and Gynaecologists.
PS - Today's Enigmatic Variations is quite good, and no 'issues' this week!