M&M Windows: Quality Secure Double Glazing for the best windows, doors and conservatories for your home. At the heart of every M&M PVC-U frame you will see the name of VEKA, a name synonymous all around the World with Technical excellence and sheer good looks. All VEKA based frmaes are tried and testd in some of the UK's biggest and most perstigious public and commercial buildings, not to mention literally millions of homes around the World