F.S , As ex raf aircrewand former police observer now FI I can say that the raf issue boots are phenomenally comfortable and supple as hell. They do however not have the best sole , it wears out quickly and doesnt have the greatest grip .
In the Police due to the odd occasion where we got out omf the aircraft for Casevac work or foot chases across open land we used boots provided by Alt-Berg , a company in yorkshire , they have a website . Very sturdy comfortable boots , Ive been wearing for years and still do had my last pair five years before the sole gave up the ghost
have a look at their website