It's no easy task to take on the rearing of a nestling Garry, have you contacted any wildlife centres for expert advice? You could try here ...
directory.helpwildlife.co.uk/
2013 photos & vids here
eff37 on Flickr
And that is illegal!!
Regards,
Ian.
It is not illegal to try to help an orphaned or injured baby bird with the intention to return it to the wild when it can fly ... it's illegal to intentionally take from the wild to try to keep or sell on! ... as I understand the laws protecting wild birds!