What has this got to do with the subject? I thought you didn't believe Sheila rang 999 for an ambulance?
I have been mostly dubious about the claim that a 999 call was made - but have never completely wrote-off the claim. To me it is a possibility. It was looked at for a reason and one of the ex officers interviewed said something a bit odd. He expressed that he was surprised there was any record of the event. This could imply that he was previously under the impression that such a record had been destroyed. 999 is a number anyone remembers, including Sheila. If a 999 call was made, I doubt it was in relation to requesting an ambulance. I think it more likely that the police brought up the ambulance as a result of the 999 call. However, as I have said, I remain unconvinced such a call took place.