Last night - at 3 months and 10 days old - the twain slept through the night!!!
They went down at 9:30 after their mega-feeding and then Sir Miles woke up at 4, but was mollified in 3 minutes when TD gave him a binky and then they slept until 6am! After another mega-feeding, they slept until 8:45!
It's a Christmas miracle.
Let's see if it happens again...