A further email has landed from Graham Lay - he thinks the figures may have been 30mm but can't be sure. He has also been reading your comments here.
Thank you so much for your further e-mail. I had no idea that Donald Featherstone had died recently, what a loss. However he has left behind a huge legacy of which we can all be grateful.
I am truly sorry that I cannot recall the size of the figures as I know how important this is to the identity of the makers. I have viewed again all of the recording we made including that which was left out. As you will no doubt understand, we often take up to 30 minutes to record all that is needed, which is edited down to about 4 minutes. Much of the remainder is no more than repositioning things and video that we can use in editing later (what we term 'cutaways'). These consist of close-ups of a finger pointing, or a minute of me nodding and suchlike. However the day is incredibly hectic and it is difficult to remember all things. Even so I am pretty sure that I recall 30mm, although I may be mistaken. I hope you will be able to discuss this with the family perhaps.
Having read some of the other comments one of the things that I recall was that 'miniskirt' highlanders were felt to be repainted French figures and not moulded as Scots at all. I think it is important for you to discuss this with the family really. Will you let me know if you do so and what progress you make please? I would be truly interested to know your thoughts once you have gone deeper into it.
If any further progress is made, I will let you know, but timing may be dictated by the wishes of the family, should they make contact.