Discuss holidays with the diabetes team before going away particularly if you are going abroad. Plan well in advance and get supplies ready a week or two before. Ask for a travel letter from clinic as this may be required at the airport.
Many holidays involve more exercise - swimming, walking etc. Monitor glucose levels to see the effect of the extra activity. You may need to make insulin adjustments to reduce the risk of more frequent hypoglycaemia.
Hot Temperature: insulin needs to be kept out of direct sunlight, this is particularly important with tubed pumps, so put them under a towel or clothing when in the sun. Use a cool bag/ Frio bag to carry insulin. Keep spare insulin in a fridge if you have access to one. When you return from holiday start with new insulin that has not been away with you.Cold temperature: Insulin does not tolerate being frozen, so keep it somewhere warm. Wear pumps under clothing and protected from freezing temperatures if you are skiing or walking outdoors in cold temperatures.
Local flights to mainland Europe require no change to insulin but a country more than 3-4 hours time change requires some planning. Remember to change the time on any devices, so that the right amount of insulin is delivered at the right time.
Make sure you have enough insulin, pump equipment, sensors, needles and glucose checking kit. If on a pump you must have emergency pens and insulin in case the pump fails. You may need to go on injections until the pump can be replaced and need to know your insulin doses in case this happens.
Do not put spare insulin in your main luggage as it will be too cold in the luggage hold of the plane and it may get lost. Split spare equipment up into different hand luggage. Insulin should always go in hand luggage.
Make sure you have health insurance covering your diabetes. Admission to hospital abroad can be very expensive.
Your insulin pump should already be on home insurance - check whether this is covered if stolen or broken on holiday, or if it needs to be listed on travel insurance.