Just noticed this on the Collins Boat Show web...
Jubilee Closures - Saturday 19th January 2008
Due to scheduled engineering works on 19th January 2008 on the Jubilee Line between Green Park and Stratford, visitors are advised to connect with Docklands Light Rail services from either Bank or Tower Gateway where there will be an enhanced direct service to Custom House for ExCeL. The Central, Circle and District Lines connect with Bank and the Circle and District Lines also connect with Tower Gateway.
If you are travelling from Main Line stations we advise that you connect by using the following stations:
Waterloo, London Bridge, Euston and Kings Cross - take the Northern Line for Central Line or direct to Bank
Paddington and Victoria - Circle or District Lines direct to Tower Gateway
Charing Cross - Northern to District and Circle Lines direct to Tower Gateway
For further assistance, we advise using the TFL website for up to date information or alternatively, please call ExCeL London's information team on 020 7069 5000 pressing 0 for assistance.