For a smaller extension for a owner installer client working in Construction. Purchased one window and one sliding door. (looking to replace the rest of the existing windows following the initial installation) Great price. Great quality. (recommend the upgraded lock feature) Arrived on time and as expected. Packaging great and true frame alignment. The instructions refer to spacer bars but it was clarified that normal spacers would be sufficient. Still awaiting confirmation of the thermal performance to be submitted to Building Control although I have been reassured this complies over the phone. I was surprised at the narrow clear width of the sliding door for an 1800 sliding door. To be fair intended for trade installers I had some difficulty getting the top fixings into the steel lintel but to be fair that does not reflect on AWM. Followed the measuring advice which was very helpful as the existing brick openings not true. I measured the openings with the old windows still in and might recommended some guidance is added to take in account steel lintels which are typically covered in sealant joint and only apparent once the old windows have been removed. In retrospect I could have checked that before by locally cutting seal out. (Measure twice and cut once and all that...!) Some guidance to confirm the depth of the cill piece required would be usefull. All in all would use again subject to thermal performance datasheet being provided.