I wrote up your example as a demo on trunk:
- 
http://docs.codehaus.org/display/GEOTDOC/12+Using+a+Loop+to+Join+FeatureCollections

And started experimenting with dwithin for you; looks to me like it 
allows you to buffer back inside your geometry by the set amount.
- intersects - gives me 88 pubs
- dwith and 1 km - gives me 60 pubs
- beyond and 1 km - gives me 417 pubs

I always use not / disjoint myself... but to each their own.
Jody

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