I think they changed the emulsion in the roll film version after they discontinued Delta 400 in sheet film, so the new stuff is not the same as the one previously sold in sheet sizes.
I seem to recall that Simon or someone said that a lot of Ilford customers did not buy the original Delta 400 sheet film in favor of HP5+.
Of course, I also remember reading that many customers did not like the old Delta 400 (or was it 400 Delta?) in any form. The new stuff is certainly better in my eyes than the original.
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