On Thu, 2 Sep 2010 23:27:05 +0100, Mike wrote:

'IF' you have a gutter and 'IF' you have a drain

And it's legal to put surface water into that drain... Mind you if
it's round the back I doubt anyone would find out. B-)

Has one of the OP's neighbours got a down pipe near the boundary?
Maybe a divertor could be fitted into that fed to butts each side?
One for the neigbour so they get some benfit from the having the
divertor, butts linked at the top so you can't use "their" water and
yours fills after theirs.

--
Cheers
Dave.