Hi
@HannahWenty, Welcome on your impending visit!! From Adelaide !! In addition to what is below: please use the search bow in the Forum page to righthand top corner, and search under 'Travel" for other threads which may assist you.
A wise friend of mine, a T1D and a rep for one of the insulin companies, and thus frequent flyer: had this method.
He would wear two watches (and try to not look like a dodgy watch salesperson) and
keep one set on home time and the other set to the current time zone. He then would use his short-acting insulin for meals as they were presented to him and take his long-acting insulin based on home time. The same could be done with one watch and a mobile, as long as one has access to charging one's mobile!! I know waiting bays at airport departure lounges have recharging outlets - provided one has the required plug. Because I have an insulin pump which with a rechargeable battery and a mobile phone I purchased a small portable battery charger (power pack) with leads to charge both (iPhone - lightning, pump -mini-USB)
Once he had reached his destination (or at least the place where he would be staying for some days)
he would work his long-acting insulin around to match the new (non-home) time usually shifting the timing of the long-acting dose backward by 2 hours per day but also depending on whether the new time was only say 4 hours ahead, or 12 hours behind etc.
I have carried insulin in my hand luggage as one cannot be certain that one's baggage in the plane's hold would not be exposed sub-zero temperatures.
Freezing insulin inactivates it.
No problems at security checks but it pays to have insulin in its official dispensed boxes and preferably a letter from a doctor (apparently in UK the endo will not charge for it but the GP might) as that helps to explain the presence of needles and syringes. Also in theory one is not supposed to have inflammable substances in the cabin. I take in a small packet of moist wipes to clean fingers before finger pricks as metho swabs might breach the in cabin regulation bans on inflammables.
As
@Mike D mentioned summer in Oz can be hot. Here in Adelaide for instance with current temps in the high 30 degrees C
I keep my out of fridge insulin in a cooler bag with an ice pack for during the day and carry insulin around in my backpack with smaller cooler bag and ice-pack. If you read the pamphlet in the box with your dispensed insulin it mentions that insulin out of the fridge needs to be kept above 0 degrees and below 30 degrees C and in those conditions is supposed to last 30 days.
I am sure you are aware that UK and Oz have reciprocal healthcare arrangements should you ever need to replace insulin etc.
There is not room here to explain Aussie slang and culture but there are some sites on the net about 'Strine' (an exaggerated version of how we pronounce 'Australian'.
But please enjoy our country with all its quirks and joys !!
ADDIT: I have been out shopping and because of the 40 degree heat I chickened out of walking to and fro and carrying things home. This goes against the very nature of being tough and Aussie but commonsense prevailed.
The temperature in the car left with sunshades over the windscreen out in the open shopping car park reached 48 degrees C ! My spare insulin, pump spares etc were in the car in a cooler bag with an ice-brick at a cool 10 degrees C.
Stay cool !!
Touristy Tasmania - Lavender fields forever !!!