A very difficult decision to have to make on Thursday afternoon, with no Underground services and no bus services in Central London, and with many main-line stations closed. There was no information at that time on when services might start up, and it was not clear first thing on Friday morning what would be running in Central London. It was felt necessary to make a decision and publicise it rather than face problems with being unable to open due to staff unable to reach Central London. At the time, it was pretty clear to those of us who work in Central London, that a request would be made for non-essential journeys not to be made on Friday to ease the burden on the police and transport services. As I write this on Saturday evening, it is clear that it is likely that there will be problems still in Central London until at least Monday morning, and the Piccadilly line will be suspended for longer - the information I am reading suggest it may well be some weeks before that section is reopened because of possible damage to the tunnel lining. How soon the Circle Line through Barbican station will reopen is less clear, although access for forensic teams is a lot easier in those tunnels - my guess is that services will resume within a week. I make my comments with knowledge of the space available and what has to be done, and having worked in the railway industry for many years, including incident management, although, thankfully, nothing like this. As has been pointed out already, the Society does not open its doors for research on Mondays, although some staff and volunteers are in the building on Society business. Frank Hardy