Thanks deborah,
Im confident that my husbandry is as spot on as can be, everything is controlled temp wise with accurite temp guns,humidity is not a problem. My other snake has the same set up and is chopping away regulary as can be.
I know 40 grams is not to much, its his overall weight that was my issue as his always been very slender bodied snake, even though he has eaten very well up untill now.
He is my first ever snake i bought, and although i treat all my pets with the best care possible this little guy will always be special, his a great snake.
Again, i will monitor his weight and behavoiur and hopefully post agin with some good news soon. Your comments have eased my worries somewhat.
Thanks