[Andrew Moxom]

Rich... Great shots!!!!

Can you tell me what your aperture was for most of these???

My advice would be Fuji Acros instead of HP5 for this kind of shots. Hands down better for this in my opinion based on far superior reciprocity characteristics.

These might give you a sense of my results for something you might be after (tech specs for development in the image titles, most taken at f/5.6 for between 3-5 minutes):

http://www.flickr.com/photos/38698047@N00/222902921

http://www.flickr.com/photos/38698047@N00/222902863

http://www.flickr.com/photos/38698047@N00/412281169

http://www.flickr.com/photos/38698047@N00/222903028

All taken late at night.