Yes it does, look at the notes that relate to chapter 21 - number 23 states clearly "Ian Craig W/S i October 1985" - The same information is also available in Blood Relations page 20-21.
If you have the paperback, it may be different but you just need to look up the item number relating to the chaper in question. In the hardback it is in chapter 21 and the item number is 23.
Item 23 relates to the following:
"As DS Jones and Miller parked up in Page Lane, they spotted Jeremy walking towards the field. He had spoken to Dr Craig about the supper table discussion ending in a row about the care of the twins, whom he described as 'ill treated by their mother'.23"
I have the hardback. CAL identifies 3 sources of info from Dr Craig for chapter 21:
Item 11 : "Ian Craig, notes for Essex Police 'A review of the Bamber Killings', November 1986. Unless indicated otherwise, all quotes from Ian Craig in this chapter are from this source".
Item 13 : "Ian Craig, w/s, 7th August 1985.
Item 23 : "Ian Craig, w/s, 1st October 1985.
We were both wrong. I was wrong as I said there wasn't a source and there is it's item 11. You were wrong as you said it was item 23.