Whilst driving along the Embankment Saturday evening I noticed two small coasters on the South side of the river just below Battersea power station. I imagine just behind the New Covent Garden building or thereabouts. Both were light blue and either grey/white one was parallel to the wharf and the other one was adjacent to the wharf. I have never noticed these two before (probably because it is dark when I run along there). Does anyone know who they are or what company they belong to, are they still working or just laid up......??