Professional to begin with. Told me the upvc was of “virgin plastic”. (Not recycled and therefore doesn’t discolour) After 1/2 years of installing the frames have discoloured and obvious different plastics had been used as there are colour variations. My windows look like cheap rubbish, I fact the council use better quality frames on their houses! Called them up , came to look at windows and tried to blame me that they wasn’t being cleaned properly. Would never ever use this company again neither would I recommend them... Dont waste your money. Pay that extra for better quality!!