Initially, prior to installation the service appeared professional and competent, sadly it wasn't the case upon installation and the corrective work needed post installation! Day of installation - arrived, removed old patio windows and then subsequently realised they had left all the fittings behind in Peterborough ( I'm in Essex) and its Nov. The resorted to try an refit my old patio windows while they got someone to deliver the missing fittings from Peterborough. ...3hrs later missing parts arrive and the out come my patio doors again. Seems to be progressing but daylight hours and the fitters starting bemoaning their day and journey back home. They finish but upon their departure we realise the non sliding door wobbles and big draft from gap between frame and door. the trim around the door is bowing and the vent is like a boomerang leaving a big gap and draft. Contact Anglian Windows the next day and wait 3.5 weeks before a reply, offered an engineer visit to rectify TBC, wait 3 weeks engineer arrives, agrees faults, makes list and leaves. Wait 3 weeks ...ring customer services to chase and get another works appointment in a months time! ....same engineer turns up! I was told this and that needed to happen on the 1st visit to rectify the errors at installation. As it transpired the rectification involved a sealant gun and some sealant ....Nearly 3 months I wait for poor quality workmanship to be rectified and not even an apology Not recommended, customer service needs some training.