Sadly I missed the births- I checked Sophie at just after midnight when she was showing no apparent sign of labour - then woke up at 3.30 am to find all kittens clean and tidy!
Even more sadly, one of the kittens has since died for no apparent reason although Sophie and her friends took to moving them several times on the 18th and I suspect some damage may have been done. Thankfully the 3 remaining kittens are now settled and putting on weight well.
I think we have a black silver (girl), brown silver (girl) and bumese colour restriction chocolate silver (boy). The boy who died was a chocolate self.
Here is a picture of Sophie with the 4 kittens taken on the 17th.