Took a while until I found Modern UPVC Windows online. There are a lot of providers of similar services but the reason I used Modern UPVC Windows is because their website is so easy to use and it goes straight to the point. It gives you all the options you need for the windows and frames and saves you calling in to add extra bits. Very easy to order and free delivery for my order even if my house is in Wales. Couldn't find cheaper prices for supply only windows. It is as simple as buying something from amazon, you select the item, you pay and they deliver it to you. Would definitely recommend to others and use again if need be.