On the 26th Nov. I sent this message to Crittall at the address given in one of the review answers.
"Crittall windows have been installed at various times in the last ten years in Manor and Grange Courts, Cambridge. The windows are elegant and show no signs of deterioration. However, the same cannot be said of the locks, handles, stays and hinges, some of which show serious signs of pitting and corrosion, making it difficult and sometimes impossible to open the windows. Our managing agent, has been in touch with Crittall over the past year and they finally sent an engineer, Mr. Geoff Lapper, to view the windows on the 18th July. He visited several flats and took many pictures and also agreed that the issues be solved. Since then our agent has tried repeatedly to get a satisfactory response from Crittall, but without success."
In keeping with their usual behaviour, Crittall have not had the courtesy to reply to my complaint.