Another update on my robins.
I guessed the robin that eats from my hand was female from it’s head marking. I now know I got this wrong.
Yesterday I witnessed him courtship feeding his mate. He took suet from my hand and flew to her and put it in her beak.
I had to look this behaviour up, as I have not seen it before. The male feeds his mate starting a couple of days before she produces eggs.
He will continue to feed her whilst she remains on the nest. As this only happens for a couple of days away from the nest. I was very lucky.