KPO usually rehearses at St Peter’s church, 119 Eaton Square, London SW1W
The nearest station is Victoria (underground and main line) which is about a 5 minute walk. The nearest alternative underground stations are Sloane Square and Hyde Park Corner. Free parking is available in the church car park and also on the surrounding streets after 6.30 pm.
(Note to Nick: can you insert a google My Map of the church which also includes Victoria station.)