Hi Billy the Squid
I'm always ready to help with such matters.
CAP 555 and Jeppesen is always a good source. There are also
some specialist companies who have alot of contacts.
Checkout
www.ramjet.ae. Mention magdrops recommended you.
I've used them a couple of times and they come up trumps with the permits I'needed. Had to pay for the service of course.
There are others equally as good.
Also try TIM Travel Information Manual re visas etc.
Try Foreign Office website also
But whatever try and cross check information you get as sometimes info does get dated.
Let me know if you need further help
Good Luck