Clarke's site also has a number of other diversions, including a Flash game allowing you to assemble a radio ad from prerecorded clichés.
Actually, her voice on the tube is anything but "inflectionless" and she has been given free reign to make it really really irritating. I hope that, now she has shown her disrespect for the job by making spoof announcemetns on her web site that these announcementsare replaced by a voice that is pleasant to listen to and not put there for tourists or someone who is making just one journey - how about Joanna Lumley? Now there is a voice that purrs!
Apparently TfL didn't find it so funny:
http://news.bbc.co.uk/1/hi/england/london/7113545.stm