A great place to start the day if you are in South London is Federation Coffee in Brixton Village. The food is great and so is the coffee. This is a very chilled place where you can get both and indoor and outdoor experience (even though the whole place is under the Village roof).
Forget Selfridges or Liberty! Fenwicks Contemporary Womenswear department has the biggest selection of Sonia Rykiel this side of Paris, amongst other great labels such as Thomsen, Dagmar, Les-Prairies-de-Paris and See by Chloe. But the best thing about it – it's quiet!