
PVCu can suit Grade II! Bison Frames launches petition to get English Heritage and local planning authorities to embrace aesthetically sensitive PVCu windows Trade fabricator Bison Frames has just launched an online petition on the campaigning website 38 Degrees to encourage English Heritage and local planning authorities to accept high quality period-look windows in Grade II listed building renovations and in buildings in conservation areas. Mark Tetley, Bison’s Director, says, “Many people who live in Grade II listed buildings and conservation areas have to endure ill fitting, cold and drafty windows or suffer the cost of expensive replacement timber windows.