My DH is taking my DS on holiday to Scotland with a group of friends, and it would be so much easier if he didn't have to faff about with formula.
DS will be 11 months and 1 week. He's on the 50th centile and eats a good range and quantity of solids.
I'd probably change him over a few days before he goes to make sure he likes it.
He's been having cows milk on cereal for some time now, with no problems.