I've heard you can get a great price on a one way ticket to canada from the UK if you can travel the same day - question is will you be allowed in without a return ticket? (one adult and three children for the summer holidays)

Cheers

Unless you have a right of residency, one way tickets can cause you all sorts of grief, from being allowed to board the aircraft to when you try to clear immigration. This would be compounded by one adult traveling with children.

One adult with children would be advised to have a letter of authority to travel from the other parent as well.

Not to mention the practicalities of organising three kids that quickly.

My wife is a miracle worker

Thanks for the info, best get a return ticket then

I would. even with no complications immigration is a nightmare with three children.
I've always had to show my return ticket plus letter from other parent with permission.