Rona recommended this:

Chuckle / Waggle Product Description - Premier Pet

which I thought looked excellent. I must get one! I have taken all the rawhide chews away as I was worried by his tummy upset. Today I loaded a kong with cold well cooked scrambled egg and he played absolutely ages with it.

I am going to go to p@h tomorrow to look for some more toys for him to chew, which arent rawhide, but with which I can load his food into to keep him occupied .

I would be grateful for any recommendations you have to make, suitable for a Yorkshire Terrier pup. Anything that you have and works well. I already have a puppy kong.