[Radiodog]

I am guessing the staff were unable to get into TV Centre, whereas people were probably in place at Westminster, hence I guess why Huw was there.

 I am not sure if it happened in the end but the following Sunday BBC1 were due to show a remembrance programme about 60 years since the end of Second World War which included a church service. This was due to be presented by Huw and I believe he was rehearsing this in Westminster on the morning of 7/7. Apparently this rehearsal also confused sky news who reported that ‘troops were out on the streets of London’. They were but only heading home after the rehearsal was cancelled due to the events.