so you have been persuaded to be a front end cache for photo.hawaga.org.uk. sucker!
basically you need this inside a virtualhost directive, and also
uncomment:
AddModule mod_proxy.c
and
LoadModule proxy_module libexec/httpd/libproxy.so
ServerName photo-YOURNAMEHERE.hawaga.org.uk ProxyRequests Off ProxyPass / http://photo.hawaga.org.uk/ ProxyPassReverse / http://photo.hawaga.org.uk/ CacheRoot /tmp/cachetst/ CacheSize 100000 CacheGcInterval 0.3