Tower Hamlets Park rangers run a series of nice events for bird lovers and those just trying to observe nature.
I have also put up bird feeders myself, and programs like Winterwatch have stimulated that.
There are a number of bird foods available like dried meal worms, fat balls, seed packs. I think that the Poundland store in Stratford has the largest and cheapest selection.
My own bird feeders have attracted a number of robins and other local birds, which are a delight to watch.