Its all up in the air here mate as I was of the understanding that the parents meeting at the school was in the afternoon. So off to swimming lessons afterwards. I know the father is almost blind so I would suggest yes either the mother of step grandfather took them along to the pool but I would doubt that she was left alone at the pool. If it was my kids I would have quite happily watched them progress in their swimming and got them ready to go home afterwards. It would be interesting to know if any of Bridger's kids attended the same pool or if he was at the centre that may have had a gym or such at the same time.
If you remember the case just a few weeks ago of the young girl from Croydon that went missing, It took what 4/5 days to find her and by proxy of where she was found they could charge those responsible, no problem there but that was the Met force at work, big budgets and all the experienced staff they needed and yet it took days to even find the poor girl who hadn't even left the house at all!! We have a case here where officers were dispatched to an address that Bridger had stayed in but had asked a neighbour where the residents were, she replied that she didn't know where they were but that the previous resident she had seen only minuets before walking along the road Bridger would later be arrested on. Bridger was the man they had went round to talk to only 17 hours after the abduction! and must have been on the radar before then. This guy had to have been known to the police or under some sort of survailance before all this kicked off.