Was told of 2 ways to remove a warp, but sods law my warped stuff is worth a fair bit so have nothing to try it on....
Here's what to do:
(1) The oven ( )
Put the record in a low heat oven for 10 minutes or so. Take it out and flattening it using 2 pieces of glass........... should you be able to find 2 spare sheets of glass
(2) The pan ( )
Boil a pan of water. Line inside of pan with something (cloth etc) to avoid record melting on side wall. Turn hob off and put record in for a few mins take out and as it's not squashy hot shape by hand, or again using the glass.
Fiver to the first person to try either