If you can get to South London there's a Anarchist infocentre there. They have free bike mechanics and a pretty well stocked tool cupboard which you can use any of the tools for free (don't think you can borrow them though - as in take them away)
http://www.56a.org.uk/bikeshop.html
http://www.56a.org.uk/
Think there might be one up in hackney too but I've never been there
@MyQul started
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If you can get to South London there's a Anarchist infocentre there. They have free bike mechanics and a pretty well stocked tool cupboard which you can use any of the tools for free (don't think you can borrow them though - as in take them away)
http://www.56a.org.uk/bikeshop.html
http://www.56a.org.uk/
Think there might be one up in hackney too but I've never been there