Welll! Here is an update

Shortly after I posted this, I was given some hens - Silver Laced Wynadotte,White Light Sussex and a Speckeldy (as it turns out!)
My RIR cockeral got right down to business, so it wasnt long before I could collect eggs to hatch

Of the 14 eggs I incubated, 3 were not fertile, 3 didnt hatch, of the 8 that did hatch four were clearly male (the Light Sussex & the SLW chicks all yellow)
Which left me with four chicks, from the speckeldy a black chick & yellow chick, and the CLB gave me a male & female, so I am keeping them four to see how they turn out!
So a rather mixed outcome! but its been a huge learning curve

I think I need a seperate hatcher, as I think the 3 that didnt hatch got moved around a lot by the earlier hatched chicks.