Thanks for the replies folks - I'm (kind of) sticking to the Runner's World intermediate 5K schedule in preparation for the Flora Light in a couple of weeks and today's task was 10 min followed by a measured mile (hence the Regent's Park track question) followed by a further 10 min. Knackered now!
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Got this answer when I posted a question on the Serpies message board.
It's on a notice on the board by the entrance.
http://www.runtrackdir.com/details.asp?track=london-rp
Erm... dumb question... but what is material is the track made of? (I go running here late at night when it's dark so I'm not 100% certain).