If you are a passionate hobby interior designer — go to the Fulham DIY shop. Going there most of there customers are electricians, builders etc. who go there as a regular to order wholesale. Before the smoking ban they even were allowed to enter in with their light cigarettes — that is how easy going this place is. From the bottom to the top there are shelving with anything from nails, toolboxes, tubes, window handles etc. I once made my way there as my window screw broke. They had several versions of my broken example and I could close my window in a couple of hours again. That was a relieve. They also have more stock in the backrooms, therefore whatever you need, ask — they might have it. What I appreciate, even though there is a counter where you get served, you are allowed to have a look around. The service is very polite even when you only buy 4 screws.