Hi there
Thank you for the advice everyone.
I am new to this forum and didn't realise that I wouldn't be notified when a reply came in!
I called my vet and he was next to useless, so I went online to search about turkey poults. The first thing I discovered was that they were on the wrong feed.
Turkeys need much higher levels of protein than hens and ducks, also they need medicated feed.
These poor little things weren't getting the basics so I searched for their food and got some in from a friendly farmer who was also a bird nutritionist.
He was extremely helpful, he offered to come and inspect the birds and he said they were doing well. The five remaining from the first night are alive and well and stopped smelling after two weeks or so, so maybe they were just soaked in excrement as you say because they didn't look like they had poo on them, poor little things.
They are all thriving now and there are two more poults that I hatched later living in with them, they are outside and getting bigger by the day now :0)
~Thank you for all the advice everyone ~
As an aside ~ The nutritionist also told me that I can feed the chickens and ducks on the turkey food as well and it won't do them any harm, they will just grow quicker!