Hi,
Thanks for your replies
I phoned my Health Visitor up and asked about it, explained I transport it in a cooler bag and she said it is totally fine to do that as its like keeping it in the fridge to defrost slowly.
Fiona - I think Ill take your advice and defrost it over night in the fridge and then take it out in the cooler bag the next day :-D
The Health Visitor said it's only if you leave things in the warm all day long and then feed them, which I had already guessed was not what you would do anyway Lol.
xxx