I have a local shop Clas Olson (like a cross between Ikea, Maplin and Homebase!) that sell the good ol' lead stuff:
[url="http://www.clasohlson.co.uk/Siteseeker/Search_o.aspx?q=solder"]http://www.clasohlson.co.uk/Siteseeker/Sea...o.aspx?q=solder[/url]
I tried the Maplin silver solder and not only is it hard to melt, it doesn't stick anywhere near as well as the 60/40.