I would like to express our appreciation for the recent work carried out by Dan Bullen to install replacement sash windows at our house. He was quick, highly skilled and very considerate about all the general disruption that the installation was bound to cause and ensured everything was left clean and tidy each day. The way in which he overcame problems was admirable. We are very pleased with the new sashes made by Ventrolla and with the new secondary glazing units installed at the same time. The latter are easy to operate and have considerably reduced traffic noise level.