Thomson Craik & Co Ltd Perth

Collecting litter on Kinnoull Hill, I was surprised to find a lemonade bottle in new condition made by an old Perth firm. It seems Thomson Craik stopped making soft drinks in the 80s, before I came to Perth. Do any of my Scottish followers remember them?

I wonder who has been saving this bottle for 30 years or more, abandoning it after a picnic this year? I found an AG Barr bottle of similar age a few minutes walk away, on the same day, so perhaps they have a collection.