Hi!
For people within striking distance of London http://www.londonorgan.co.uk/ is useful.
The train to St Albans is very fast and www.organfestival.com covers details of concerts in St Albans featuring James O'Donnell, Samuel Liégeon, Joonho Park, Thierry Escaich, Jane Parker-Smith, Stephen Disley, Yuka Ishimaru and Gerard Brooks over the coming year.
Best wishes
David P