We recently moved to a house which had used Anglian Windows to replace the windows. We noticed that several of the sealed units had misted but did not consider this a problem as the windows were less than 4 years old and according to the guarantee the sealed units were covered by the guarantee until 2032. We enquired about transferring the guarantee into our name and after several phone calls chasing a response we were informed that they required an inspection visit by one of their engineers to ensure that the installation had been maintained in line with their maintenance guide. The cost for this was £250. If the engineer considered that it had, we then had to pay a further £49 per contract of which there were 2 to cover the process of transferring the guarantee. The £250 was not refundable and I replied stating that this extortionate fee was unreasonable as I did not know what the previous owner had or hadn't done but I have no idea what she could have done to prevent the glass from failing in such a short period of time. Ten minutes later I received a reply saying they could not help me further. Be warned - their guarantee is worthless and their Customer Service is atrocious. If they can avoid rectifying their faulty workmanship in any way, rest assured that they will do so.