Fred wrote:
On Sun, 21 Oct 2007 15:09:49 +0100, "Brian G"
wrote:

I bought a pair but I notice the holes do not line up with the ones
in the original. Is this a problem? What is behind the uPVC? Is it a
wooden frame? If so, could I just put the screw where the new holes
are?

Just insert the screws into the frame using the holes in the new
hinges - different makes have different locations. Just remember
not to overtighten the screws as the 'thread' will easily strip in
the uPVC.
[...]
Generally nothing in the uPVC - unless the window or sash is of such
a size that it needs reinforcement - and that will usually be either
steel or aluminium.

Thanks for your advice.

Is a upvc window just a plastic frame then? I never knew that. I
always thought the plastic covered a frame of wood or metal or
something.

Fred,

That's all a UPVC frame is - a hollow, extruded lump of plastic that comes
in various shapes and sizes - have a look at the profile here
http://www.qualplas.co.uk/windows.html

Brian G