London For Free
Before any pedants start complaining I know it is impossible for anything to be absolutely free. If you do not live in London you will need to get there and you will need somewhere to stay. So this guide assumes you are already in London and have sorted out where to stay.
You also, of course, need to get around. There is nothing wrong with leg power and Central London is easily walkable for any fit person, you also get to see some hidden gems you would otherwise possibly miss. Alternatively a one day travelcard is a cost effective way to move around the City.
A Zone 1-2 off-peak travel card costs £12.10 (Sep 2016) and provides unlimited travel on the tube and buses in most of central London. The suggestions in this guide are located in Zones 1-2, unless otherwise stated.
This guide is broken down into different categories so you can ignore the things that do not float your boat.
Some events need to be booked in advance, where this is a requirement it will be clearly stated in the guide.
Enjoy.
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Regular Events

Basically what it says on the tin, events which take place on a regular basis which can be viewed or enjoyed at no cost.
Perfect for the Old Moaner who wants to save money.
Click here
Indoor Attractions

Indoor attractions which do not charge an admission fee.
(Some may request voluntary donations or charge for special exhibitions.)
Click here
Outdoor Attractions

Outdoor attractions which make no charge.
Clearly these will be weather dependent and one thing London cannot guarentee is fine weather.
Click here
Free Shows
Watch a TV or radio show being recorded or maybe take in a free concert?
Click here