I decided to look for something not quite so old but still vintage to stack on top of the wardrobe or under the bed. I found the large brown suitcase for just £5, it is in very good condition, the lining on the inside is immaculate and comes with a key.
Then a couple of days later some body put the two blue ones on free cycle, they are in lovely condition too and the larger of the blue ones is lined with red silk. Three at once... couldn't believe my luck, the children were just as excited as I was and they have already made plans for what to store in them.
Although not quite as old as I was originally looking for they are just as useful as a storage solution and at a much more reasonable cost.