Thanks for that not up to scratch when it comes to this Underground lark!
A bit off topic, have just seen your video on Youtube (
http://www.youtube.com/watch?v=jbpk9dm8dLo ) and was appalled by the way the station security/driver of the D-stock acted! I was hoping to get out for Sarah's return on Wednesday at Upminster but may not bother having seen the hassle!
Hope you can get some form of apology anyway.