I'm sure he presented This Morning with Anna Soubry (ex Central East co-host, now MP) who was already on a slot on the sure. But sure in Richard and Judy times before Fern.
Yes, very much in the early days of This Morning - Craig and Soubry were regular stand-ins in the early days, while the most regular were Stephen Rhodes and Alison Keenan. The show was a bit less glamorous in those days. Craig also presented the "rival" Beeb show Daytime Live.
Of course, while Anne and Nick are the famous couple, there were dozens of other presenters. When Nick left in 1986, initially he was replaced by the reporter Adrian Brown, but after eight weeks it was clear it wasn't working out and he went back to reporting (although unfortunately the 1987 IBA Yearbook went to press during his spell so it's full of photos of him). Then after that anything went on the sofa for a while.