Boot ID help

Hi,
first of all, my english is not so good, sorry.

I got a pair of boots from my grandfather some years ago.
They are in very good condition and i would like to know which kind of boots they are?
i attached some pics
Can somebody help me please?
Thank you very much

PS: inner sole writing " EC GRAVESTOCK LTD 1940"

 

Putting "Boot ID help" in the title will likely speed up the process.

 

They make me think of furred early war RAF boots

 

http://www.rushdenheritage.co.uk/Villages/commerce/gravestock-rau.html

The Gravestock Ltd. was a British shoe manufacturer. No longer in business but they were during the war.
The boots the soldiers and the prop have on look to be zippered with no separate toe piece, but probably just a different type/ model.