my husband is insulin dependant, we fly all over the world, India hotels [ espicially Goa] will install a fridge in your room, if you request beforehand.You do this by contacting the hotel direct by e-mail and state you are willing to pay, the cost is peanuts.
We wrap insulin with small freezer blocks [found in picnic section of supermarkets], then on the plane we ask for a bucket of ice to put insulin in.
Beware we were once met by a car &driver at Mumbai airport and he was told to bring a bucket of ice, he brought dry ice and the insulin froze.
I am going to contact coolerconcept as this sounds good.
We have never met any opposition at Heathrow or Gatwick or been asked to produce the GP,s letter which we always carry.
The only problem we ever had was with customs on our return, but once they realised hubby was a genuine diabetic they said just go.