Had both sliding sash & casement windows fitted by Blackthorn Timber. It's a significant investment so we wanted to make sure we got it right. Lee was great at answering our many questions & offering suggestions to make sure we got the spec of windows we wanted - he did site visits & all the measuring. The fitting team were super skilled, with attention to detail and were able to make us some bespoke arches on site which look fantastic. The windows look amazing & have made the house warmer & quieter. Thoroughly professional company & I have no hesitation in recommending them.