Popped into Harrington's when I was in Tooting over the weekend to get outside some traditional London grub. I was too nervous to try eels, so I had pie, mash and liquor. The liquor seems to be some sort of parsley sauce. I found it all rather bland to be honest, but almost everything is bland compared to the Lahore Karahi nearby.
I will steal myself to go again and try the eels, but I think that may be my lot.