I believe after Gerry left the Tapas bar followed by everyone there except Diane, he searched the apartment and then went to reception to inform police. This must be when he had a quick look around I don't think he was with anyone, but could be wrong.
Nope Gerry never went to call the police until John Hill arrived. John Hill wasn't informed about the disappearance until 10.28.
"Statements show that he knew of these facts by means of a phone call from Lindsay, head of the child care service, who told him about a female child staying at the resort who had disappeared. This phone call was made to the deponent's mobile phone at about 22.28 on 03-05-2007." (John Hill Statement)
Matt went at 10.10 and was told by Fiona Payne to go. The McCann's were not involved. Fiona asked Matt to go on her own accord. It had nothing to do with Kate or Gerry.
First searches start just before 10pm, when they reconvene 10 minutes later Gerry is missing. Only Fiona, Matt, Russ and David meet up again. Fiona asks Matt to go and phone the police and then she goes to 5A and finds Kate alone. So from 10 to 10.10 Gerry is missing?