I just love this site. Thank you all for your replies and help, all have been really helpful and I now have the problem solved which may help some of you too.
I looked up the site for the FRIO packs, great site by the way and very helpful. The only problem was having read all the instructions etc it wouldn't keep the Humira at the temp of between 4-8C. Thank you for the advice though and a site I've saved on my favourites.
I decided to find the number for Humira Australia and rang them up and was put through to their 'medical section'. Very helpful people and run by nurses. The advice given was that it's o.k to freeze the travel pack you get when on Humira and put everything in there, this will last for about 6=8 hours. Once on the plane take with you jiffy bags and ask the seward for ice, place the ice in the jiffy bags (nothing will get wet then) and put inside the travel purse. Empty out water in an hour or two and start again. Once at your destination put into fridge straight away. The nurse said not to worry about keeping at the temps suggested as this was a guide. As long as you keep it fairly cold that's o.k. I must say I feel much better now as it was beginning to be a worry. The temps suggested are to cover themselves, just don't let it get too warm or 'freeze!
Hope this helps some of you too. Once again thank you for all your suggestions. As I'm going straight on Remicade on my return this wont be a problem going forward, I just have to arrange holidays around hospital visits...
Have a great weekend.