Thanks for all the replies guys....awful news come to hand....last night while I was working overnight, the temps got up to 32.6 in the incubator...thermostat obviously faulty, lucky I had someone checking it at home as often as possible.
All eggs still look good...couple have deflated slightly, possibly due to humidity levels...other than that, all is looking OK...will keep you's posted...I'm still hoping for 100% hatchings, but having never incubated when temps have soared, not sure what to expect.
Simon Archibald