My vintage wallpaper wall under threat!

Only last year Bronte and I created, what I thought, was a lovely wallpapered wall (well chimney breast) - it is in a spare bedroom so did not think to ask first.....at the time Dom did mutter that he thought he might use that room for 'men's type activities'....I think that means listening to very old rock records.  Anyway that issue has recently resurfaced and this room is again under threat - you may recall that this wallpaper dates from 1956 and  came from an original wallpaper sample book - cost £12 (a very good bargain I thought as I nearly gave in to Cath Kidston wallpaper and £350 a sheet - just joking, that would be against all my thrifty ways!).

The negotiations are currently at a tricky stage - Dom has upped the stakes by suggesting that I move my sewing room into this spare bedroom (he says he will also move all the shelves and he will set up a nice little table for afternoon tea...). By doing so he then converts my sewing room in a room for 'men's type activities' - this is a much smaller room so in theory a better deal.  BUT he then says that my wallpaper in the sewing room would have to go.....I am thinking of having a conservation order put on both...any ideas???