RedWing, thank you. That muzzle video is fab and I will try and copy how he did it to the letter. Will buy some squeezy cheese tomorrow.
Pingu - the breeder hasn't replied to my email and I know she will have read it. She responded to all my other emails very quickly, think she's avoiding me. I admit I haven't run, keep putting it off. I honestly don't think it will get me anywhere. I don't (yet) want her to take the dog back, she's only going to spin me some blurb about the dog neededing to settle, etc. If there is something about his history she hasn't told me she's not going to admit it. If she's already been caught out forging signatures on puppy contracts she's not exactly the most honest person.
I think I need to move on without her. To be honest even if we did need to rehome him I'd rather go through the Podengo rescue than her even if it meant I didn't get my £300 back. I don't think she'd willingly give me my money back anyway.
However I'm hopeful and positive its not going to come to that. He's been generally better today. Though dh hasn't been here most of the day! He did snarl/growl at dh a bit this morning but not too much. DH keeps feeding him cheese trying to get the dog to make a positive association with him.
However dh can be stubbon. Dog is under the table growling at him. DH won't listen to the warning and back off. He just says "look dog, I live here I'm sitting down". Sits at the table and dog bites his ankle. Like clockwork every breakfast time. 
I do definitely feel better now we're getting a muzzle for him. I don't have to worry about dd's friends, my nephew, etc.