Peter MacDougall?
He does/did complex birdies.

eta. I've just been looking for some of his birds, but can't find any. He did make complex and accurate birds, inbetween working at Strathearn before it closed, and before he set up making weights at Perthshire.
I met him, selling lampwork birds on agate slices, during this time. I had quite a long chat with him, I was very impressed with his birds. (But I'm not fond of agate slices, and especially not when dyed glow-in-the-dark unnatural colours, so I, reluctantly, did not buy any.)