‘Oh, umm…’ I begin, about to explain that Will isn’t my husband and Isaac isn’t my son before realising that it’ll be much simpler all round if I just play along. ‘I guess I just landed one of the good ones,’ I tell her with a smile. ‘Will’s always been a hands-on dad.’

‘Lucky you,’ she remarks. ‘He’s pretty much the only father in here, have you noticed?’

I look around and realise she’s right. Apart from one guy sitting at a table in the corner with a coffee, and the uniformed staff members, all the adults in here are women.

‘I’m not the only one to have noticed,’ she continues conspiratorially. ‘Have a look around.’

Her remark coincides with Isaac and Will appearing at the top of the slide again and, as I glance around the room, I realise that pretty much all eyes are on them.

‘I suspect your husband is going to be the cause of a good number of uncomfortable conversations later,’ my companion confides.

‘Well, thank you,’ I say, feeling a little awkward now. ‘I’ll be sure to let him know.’

I’m just starting to realise what a difficult situation I’ve put myself in, because Isaac will debunk the woman’s assumptions the moment he reappears and calls me Auntie Tilly, when her attention is diverted to a small girl approaching her table in floods of tears.

‘What on earth is the matter?’ she exclaims, wrapping her in a hug. I half-listen as the girl unfolds a tale of woe between sobs about how she wanted to have a go on a particular piece of equipment but some boy had said she couldn’t. It would be just my luck if the boy turned out to be Isaac, so I’m relieved when she points out a completely different child. I can practically feel the woman’s hackles rising as she goes into protective mummy-bear mode, getting to her feet and beginning to advance towards the boy. I’m no expert in children, but I have a suspicion the girl was hamming up the incident to gain maximum sympathy. It’s certainly what Tash and I would have done to get each other into trouble when we were little.

No sooner has the girl’s mother started to remonstrate with the boy than another woman, evidently his mother, appears on the scene as well. Things are escalating quickly, if the jabbing fingers of the two women are anything to go by, and my suspicions about the girl are confirmed by the smirk on her face as her mother goes to war on her behalf. At least everyone is now watching them instead of Will, who chooses this moment to appear with Isaac.

‘This little man is hungry,’ he tells me. ‘Shall we make a move?’