Here’s what I found.
SOLD FOR £650
During the 2010 Bonhams Dr Who auction of all the 100's of lots only one included a Dr's costume piece such is their rarity, I know of only 3 season 26 Hankies.
They were purchased as part of an almost complete costume several years ago. Having sold the bulk of the costume on, I’ve since found these at the back of a cupboard! They’re a fun item if nothing else!