Thankyou both
I have been spraying him regularly with a fine water spray and kept up the humidity in the incubator.
5 years ago I used a hovabator with success but because the las 5 years nothing, I thought I'd give a vitapod( v expensive plant propagator a try)
It is fairly big and also will not go above 30 degrees which thinking about it now is probably the reason for delay.
M hoping that I can bath him later today or tomorrow as the yolk dos seem to be reducing in size.
Thankyou for your replies