Ilford Pan 100
The Pan 100 and Pan 400 films are distributed in areas of the world where ILFORD does not have a corporate presence. They are based on FP4+ and HP5+ technology, but are produced to lower specifications and tolerances. While the quality is acceptable, these films are lower in quality than other ILFORD films.
The biggest difference between HP5+ and Pan 400 is that the tolerance specifications are less strict for the Pan 400. It is possible to see larger differences between batches of Pan 400 than you will see between batches of HP5+, although typically both are generally well within the tighter tolerances.
Worth buying and try it if you're on a budget and a 35mm film lover.