Carrier, you could try Bott & Co in The UK, who do delayed flight compensation, they delivered the goods for us earlier this year.
The website is
www.bottonline.co.uk and there is a phone number at the bottom end of the site where you can make contact and ask what they can do for you. They would be able to point you in the right direction, if unable to help, one would think.
Worth a try. Good luck.