http://www.missionfish.org.uk/NPMMF/nphomepage.jsp?NP_ID=15566

The Friends of the London Transport Museum are running a charity auction
through eBay up until the 1st October, to raise money for the
refurbishment at Covent Garden.

Amongst the items available are a used Kings Cross St Pancras tube
roundel sign, a train cab ride in a Southern Electrostar service of your
choice or have your own tannoy announcement played at a DLR station.