Are you flying from London to Toronto in early July?

Hi,
I am flying back to Toronto from one of the London airports (probably Gatwick) in early July with two young kids (3.5 and 15 months). I need someone to travel with me who would help me out with the kids in the departure lounge and on the flight - nothing too onerous, just another pair of hands while I do nappy changes, take the older one to the loo etc etc. I thought I could pay something in the region of £100 for the 8 - 10 hours this would probably involve? I would either book onto the same flight if you have booked or we could liase and make sure we book onto the same flight? Are there any Canadian students looking to help with the cost of their flight or maybe Grannies who are missing the chaos of their own grandchildren who might be interested?
Many thanks,
Sinead