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I would use http://www.domain.com/en/search/london/ (the search-path included in the URL).This has worked quite well for us.

Glad you got it. The code I like to use: Options +FollowSymlinks RewriteEngine on rewritecond %{http_host} ^domain.com [nc] rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc] Of course, replacing "domain" with your own domain. Let us know if you need any more help.

Personally long term I would work on changing the URL's so they are human readable but for now to "fix" the issue I would advise you use rel=canonical here is a guide... http://www.seomoz.org/blog/complete-guide-to-rel-canonical-how-to-and-why-not