Hello James,
I will ask Mum but she isn't very well at the moment so not sure if she will be able to look. Am going to Poland in the summer so I will look in the documents left by my grandad & I think I might be able to find some of dates with regard to his father. I suppose going to Skierniewice to explore local archives would be an idea:) - one day I may do that - when I've got some time on my hands- but it won't be for a while as I've got a young family. will keep in touch. Give my love to Beata and to Auntie Basia (when you're next in Poland). By the way where in England do you come from? we live in Devon, in Exeter.
Best Wishes
Laura