Help needed......

Hi all,
My name is Sally Snow and I work for Aden Productions, a small independent television company in Cardiff. We specialise in producing wildlife documentaries and are currently producing a 5 part series for the BBC on the Birds of Wales, which will be presented by Iolo Williams. We are pretty much at the final stages of production but are still on the lookout for a few specific items for one particular episode, the episode on urban birds. I was hoping members of the forum might be able to help us with two particular requests. It would be wonderful if anybody could. The two items I was hoping someone could help me with are as follows:
a) I was hoping somebody might have a bird nesting in their garden. Not in a nest box, but in a tree or bush etc. If so, could you please also let me know at what stage the birds are at (if you know) e.g. sitting on eggs, feeding young...
b) I was also hoping somebody might know of bird/s nesting in a manmade object/structure (that aren’t swallows, swifts, house martins or gulls as we have already featured them). A good example of this was a Great tit that we were told was nesting in a postbox. Ideally we would like to find another example like this, as unfortunately we think the Great tit may have thrown the towel in.
If anybody has any suggestions I would love to hear from you. My email address is sally.snow@adenproductions.com
Thank you kindly for all your help,
Best wishes,

Sally