Cem Optic offer an excellent service. Last year Rich damaged his frame but the lenses were fine, we went to Cem Optic with a view to having the lenses put into a new frame. Unfortunately they didn't have a frame that fitted perfectly and didn't want to cut them because it would have affected the reading part.
He had been going to get a spare pair anyway. Whilst the lens were being made, they fitted his new frames with single vision lenses, as a temporary measure, at no extra charge. When our friends brought his replacement frame they fiited the lenses free of charge.