Séan Connolly wrote:
As subject, all google seems to turn up is safestyle and the like.

I'm not after buying online tbh, I just want and idea of what sizes are
available and at what cost

Are you talking uPVC here? Have a look at http://www.u-fit.co.uk/ for
instant online quotes of custom sizes. Have never actually used the
company myself, I can buy windows a bit cheaper from an excellent local
outfit.

By the way, IME there's no particular reason or benefit to go with
'standard' sizes - eg the company I use routinely produces all windows
to order and make them in any size, there is no 'standard'. They are
still cheaper than Screwfix's identically-sized off-the-shelf windows.

David