Thanks. I have no idea what diameter my lost roll is. I don't think I was aware of different widths when I bought it. It was whatever Maplin had on their shelves at the time.
The reason I asked about 0.7 and 1.2mm solder was I was looking to take advantage of the "webfree" offer and they were the two sizes listed by CPC. However, I have now seen tool station sell a 1.0mm size for even less, so I may go with that. I am curious to know; what are the three other sizes you use?
Thanks.