Thanks James, think I'll try again next weekend before lockdown. They are jumbo Texas a&m, so am I right in thinking they may take a day or two longer in the incubator?
Haveandtohold I have also read about the float test... As long as the water is a similar temp to the inside of the incubator it shouldn't harm the eggs. That will probably be my last resort next week!
Thanks for replying guys, I was beginning to think I was an internet ghost! Hahah.
Hi, I had never candled anything, so I marked what I thought were duds... So wrong! Nothing burst in the incubator, the duds hatched first.

Everything I have read says theyre tricksy!
Good luck. They're dinky wee chicks!