Thank you for offer of help. The base of the hinge where it fits onto the window frame measures 261mm x 48mm. I have a photo of a hinge (black bit in centre is missing) but don't know how to show it......
Our Boulton and Paul side-opening windows were fitted with Shaw hinges (305S) in 1987. I've been unable to track down new hinges to replace the ones which are now worn out. Would be grateful for any advice
