Looked at my backlog of b&w films to be developed and realised I've got a roll of Pan F (yeah, not Pan F) that's probably expired a year ago and not kept in the fridge to develop. I only have Rodinal in stock now, and usually at 1+50 dilution. The spec for Pan F+ is 11min at 20C, so I assume that Pan F is the same. Read somewhere that expired film needs to be developed a little more, but can't seem to find that page. So this is going to be a major brute force method. Will see how it turns out.