Roland Perry ) gurgled happily, sounding much like they
were saying :

The tfl site merely says there have been some Circle line service
restored, but gives no details about the end points of the shuttle.

If indeed it is a shuttle,

"A shuttle service will run on the Circle Line every 20 minutes"

http://news.bbc.co.uk/1/hi/england/london/4744293.stm

Although I'm beginning to think that the BBC Reporter thinks "shuttle"
means "reduced" rather than "back and forth".

Maybe it means that the passengers have to get out and fix the underside of
the thing before they can arrive at their destination?