Could this Literature entry be used as a reference?
The Standard Catalogue of the Provincial Banknotes of England and Wales
https://en.numista.com/literature/volume.php?id=3914
Outing#
For items such as:
Which is an Outing#373a
or this item:
Which is an Outing#662e
edit: Oops, should be in banknote catalogue section.
(if a kind moderator could move it, that would be great)

