Hi Martin, no tips I'm afraid - we had about 7 females at the start of the year and they just keep multiple sitting in places we either can't find them or underneath a building which is slightly raised up and we can't reach their eggs to use ourselves, they just kept appearing with a dozen+, so that's it - ignore them for a bit and they'll have done it again.
Maybe there was a competition going on, the biggest hatch is still the first one we had this year of 17 from Sister Bernadette (our black and white Muscovy) who I think was pinching all her peers eggs too. Come to think of it, haven't seen her for a week or so ....
Fiona, if you send me a personal message on here and let me know where in Angus you are - most of our boys are (reluctantly) going for the chop as they are getting to an age where they are getting fruity with what girls I have left - I may be up your way in the next couple of weeks and I have 2 females from last year who I could pass on having brought up their broods. They will be 1 year old girls and experienced mums which is always helpful if you're breeding. Otherwise I am still waiting for wee ones to grow to a stage I can see they're male or female, so a few weeks yet! Pity about none at the show - I was supposed to be there showing but have had a virus thing going on and wasn't, was most upset.