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I think Ladywell Arena (Lewisham) is free before 9am, otherwise similar price to Mile End. Or join Kent AC and use it for the bargain price of £1.55 per session. ;-)
Or, if you fancy somewhere flat and traffic free for measured interval sessions, I've discovered that Millwall Park on the Isle of Dogs is almost exactly 800 metres round, if you cut off a couple of corners. Great for (half/)mile reps.
http://gmap-pedometer.com/?r=6342690
Anyone got any good track recommendations? I hear Mile End is quite good - 3£ a pop though..
Any free out there? Probably not ay..