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Whaaaaaaat?! I had no idea you could see the Effra there, that's fantastic. I tagged the end of it at MI6 a while back. Great work, @mashton.
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To add to @Danners infobeat, as I understand it, the source of the Effra is somewhere atop the hill at the back of The Queens Hotel (or Euro Queens Hotel - as I am informed it is now called - will it be thusly-named for much longer, I wonder?) on Church Road, Crystal Palace.
Old: The remnants/source of the Effra River in Belair Park. That's Belair House to the left. If certain blogs are to be believed, this is the only remaining section above ground. From here it makes its way through sewers and under graveyards, only to surface at the Thames, beneath MI6.
New: From one source to another.