Prams Perfect Prams

I am trying to change the inside pram bed of my 1970s SX Super Burley twin pram. I have managed to remove the top, but i cannot seem to get the inside out,it seems to be screwed down underneath where i can't get to it.,i don't want to tear it if i can possibly avoid it. Doe's anyone know how this can be done? Dulcie

I believe there are two screws holding it down by the head rest flap.  I have one to do so I'd be interested to know how you get on