Quote Originally Posted by Tom Stanworth View Post
for sure. OVER exposure is as much of a problem as under. The oft swallowed mantra of rating HP5/TriX at 160-200 might work fine in strong sidelight in the mexico desert but shooting in britain
This is what I found.

HP5+ at EI 200, developed with a 25% reduction in time works very well for subjects in bright sun with a high contrast.

For a 'normal' UK overcast day, Using it at ISO 400 with normal development works much better as it spreads the limited contrast over more of the film's range (I assume this is what happens).