This is very useful information and suggestion, thank you very much - I really appreciate it. I was diagnosed only last year and this is my first time traveling with this diagnosis. I won't bother getting an ID then.
My wife and I are traveling abroad and I found this info from this website: "However, it is worth checking the airline policy before you travel and phoning them up to make sure if you are concerned. Insulin User identity cards are available from Diabetes UK and independent companies."