Has anyone used Southern Windows in Willesden for bifolds? We were going to go with Schuco bifolds, until the builder brought in Southern Windows for a quote. The quotes are not far off each other (if we source the Schuco ones from somewhere online, rather than a local retailer who will be more expensive), but I don't know anything about Southern windows except that the builder recommends them. If anyone has used them, or would recommend somewhere else in NW London for bifolds (plus various other windows) advice would be appreciated. thanks