A few weeks ago, we came home to find a baby dunnock on the door step, we watched him for a bit but with magpies around and then he ran and fell in the drain, I phoned the RSPB for some advice. They gave us two options, 1) Put him back in the tree near his nest but with the magpies around this wasn't ideal!
or
2) bring him in, try him with cat food! Yes I said CAT FOOD.
Which we did, and a few hours later then he was flying out of the box.
we did step one.
We watched from the window as his mum came back for him and she flew off with him walking behind her lol.