Hi Billy,
I am supportive of a "Bank of England 1928-present set", because it would be a more affordable set for new collectors to fully complete, as it exclude some of the more expensive Treasury and White Banknotes.
I know from previously asking PMG for a replacement set, that they are reluctant to have new sets when there is sufficient representation in existing sets.
Personally I think that more sets are better, as it increases the possibility to achieve full set coverage. In addition for some slots like p374, with 21 varieties from B281-B323, it's not possible to show examples of all varieties. It might however be that additional sets increases the workload for PMG, in having to synchronize slots across all sets. Maybe Ali can advise?
Kind Regards
David