I think the tennis appointment wasn't given much relevance because by then Suzy had already been missing for several hours. I think DV may be right in thinking the diary was important. There's nothing salacious in my pocket diary, but if it was lost, I'd be keen to get it back as it holds other personal info. Based on this, I think it's likely the last place Suzy went voluntarily was the pub.
The Suffolk strangler was at one point a pub landlord and I think I read an article saying he had been an acting pub landlord. Will try to find the link. What are the chances of him already knowing Suzy from their time on the cruise ships and also being the one to return her missing items though?
That said, DV doesn't suggest that the Suffolk Strangler was the pub landlord. I think either an accident inside the pub or Suzy was abducted and her friend's sighting of her could well have been quite accurate.
Steve Wright worked as a pub landlord after he left the QE2. He was working on the ship during 1986, however his wife says he was on shore leave at the time of Suzy's disappearance.