15mm boards can be difficult to get hold of as the smaller BM’s don’t usually stock them & I have to travel 30 odd miles to a large regional Travis Perkins depot to get mine when I need them; thankfully not that often as they are also bloody heavy! Try ringing your nearest B&Q Trade Centre, they may stock them; if not, ask in your local BM if they can check their regional depot for stock.
Also how old is your bathroom? Building Regulations now require sound insulation of stud walls; it could be one of the specialist boards have been used such as Sound Block or Fireline.
I have to travel 30 odd miles to a large regional Travis Perkins depot to get mine when I need them; thankfully not that often as they are also b****y heavy!
They will deliver at extra cost & if it's any real distance (my regional depot is 30 miles away) you may get charged a hefty premium; I have a truck so no problem for me. Read my post about using 12mm on your other thread though.
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