Just thought I would update this thread.

Another two months have gone by and still he is not eating.
He comes out of his hide towards the rat flicks his tongue and then disappears back in to his hide and thats it.
Have left it in the viv for him on several occasions but nothing.

We are now seriously considering moving him in to a tub to see if this helps with feeding. He looks ok and is above 1kg still. Its obviously bothering us more that him, lol.