[Lobster]

So I installed the new window in a cavity wall, and closed the sides of
the cavity with bits of brick and mortar, interposing DPC behind the
outer skin, and have now drylined the top and sides with plasterboard -
so far so good.

I've cut a window board to size, but am unclear how to fit it. Does it
just sit on the bare bricks of the inner and outer leaves of the wall,
glued with nomorenails? I'm thinking maybe more DPC should be involved
here, but will it all stick and hold together if I sit the board on DPC?

Advice much appreciated.

David