plastic strip

I have a UPVC double glazed patio door which for some strange reason has wood underneath the frame. The wood has rotten away & I have removed it, supporting the window temporarily on small blocks of wood. It has been suggested that I should replace the wood with plastic, but where can I purchase...

just replaced a defective pentangle shower tray with a stone resin quadrant tray 1000x1000mm (radius 550mm). The old tray was fitted butted against the tiles (which went to the floor), and not underneath them, so it leaked. I have cut away tiles so that new tray slides underneath. I now have to...