Here's something for those people who want to explore the further reaches of London.
I know a lot of things I present to you are from within the centre of London, as a lot of interesting things happen there, and so quite rightly deserve the column inches - but London is a large and complex beast, and so warrants exploration of its further reaches.
So that leads us to Brockley, a place that sits deep in the South of London - somewhere near Lewisham should you want your bearings - and straight out of the station sits one of the nicest cafes I've been to in London.
Now I'm not saying this is a destination place - though if you want to come across London to give it a visit, you are quite welcome - but I would think it would be better as a place to stop off should you be coming to the area (and you should - there are some lovely parks in this part of town).
The reason I rate this place is they really care about what they serve their customers - the coffee is first rate, and the bites and nibbles on offer are similarly refined and tasty - not just a typical coffee and cake experience. Although it is right across from the station, so perfect for picking up a coffee as you're heading on your way, do consider taking your time and sitting in, as the surroundings are minimal, but comfortable, and the staff are some of the friendliest I have seen in London.
The phrase 'hidden gem' could easily be used for this place - but I think I won't use it - as I think you really should go there and experience it for yourself.