Just bought some nice big maps (some from OS and one from Lidl) and went to
a picture framer to ask how much it would be to have one framed and/or
mounted.

Three figure quote later I am reconsidering my position!

Someone who used to have a picture framing business suggested that one
option would be to glue the map to some hardboard then varnish it.
Nicely DIY :-)

So - any recommendations about glues?

Wallpaper paste is one obvious route.

However when they mount pictures on a card backing they put a sheet of glue
fabric between the picture and the card, then put it into a heated press.

DIY version might be to smooth it gently with a warm iron if I can get a
suitable glue sheet.

I will be consulting my friend Google but any advice gleaned from real world
experience would be most welcome.

Cheers

Dave R