Recording of little house on the prairie?

I'm not sure if this is the right place to post, but thought it would be the best community to start.

When I was little, my mum managed to record on tape a drama/reading of the little house on the prairie from the radio. We used to listen to it all the time, and I'd love to listen to it again, and I would love even more to find it for her so she can now play it to the grandchildren, but we cannot find it anywhere, even the old tapes she recorded!

She thinks it was done by BBC radio 4 on the women's hour, but I haven't been able to find any trace of it online. Does anyone know about this/know where I can look to find it?