Thanks to everyone here....
We have decided that she is broody, by how she is behaving, and also by the general consensus here. Relieved at the very least! We have never had to post because of a problem, and we are grateful to the BYC community here. Thanks everyone! Now we need to read up on broody chickens! We know we have fertilised eggs, because Wally the Wyandotte has access to all the Girls. Now we just need to see how and if she will hatch a bunch! Thanks again everyone! Anyone know of or had a Black sex link (hen) X Silvery Wyandotte cross? Both are excellent layers according to what we know..... THANKS AGAIN!!! Tom & Joseph.
PS, On the first post I had said she was a Black Austolorp, I was wrong! She is a Blk Sexlink.