Our builder Christopher Michael Construction (Michael Magee), and our architect Gavin Powell recommended you, and we are very impressed with the product, however the follow up service needs some work, currently we are awaiting a number of vents above the bifold. Doors and also door stops that need to be put on since the scaffolding is down. Unfortunately I cracked one of the bifold panels and this needs to be replaced, we have emailed and phoned and will call Josh Tuck tomorrow to discuss. In addition following the paper work for the 20 year guarentee, I am concerned that some of the serial numbers may be wrong with our order, please could someone contact me on 07932 763251 to discuss all of this. Many thanks and best regards, Rob Collecott