North British Distillers Single Grain
 

Hi,
I have a 40 year old cask strength single grain from North British in Edinburgh.
They are a supplier of grain spirit to the industry and every so often they select a batch and bottle it for employees only.
Mines has a certificate which is numbered 826 of a run of 1000.
Anyone have any info or thoughts on this?
Unfortunately I am not able to attach any photos as it says I am not allowed?