The incy has been back on overnight with the 40W bulb in it and it seems to be holding the temp ok.
Have been adjusting it with a mat over the top and think its in the right place now :)
It does go up + down a bit as the temp of the room changes, but it should be ok *fingers crossed*
Thought about getting a new thermostat or a reptile one, but it seems to be holding ok.
Eggs are being sent out today, next-day delivery, so should get them before 1pm tomorrow :D