As the operation decluttering continues I found this letter from March 1975 amongst some paper work. It was addressed to my Dad who was running the RSPCA Animal Hostel at Heathrow Airport and is in thanks to care of some elephants who were being transported at the time.
14 Weeks Worth of Socks 
Wonderful letter!
Thanks, I thought so too
It is no wonder that you wanted to post this proudly on your blog.
Its pretty unique 🙂
That is more than cool, not only for your finding the letter, but that your dad helped with that monumental task.