this in my opinion is the best flux to use, ive been using it years, the 100g will last you a lifetime, ive got the 50g tin and had it for about 20 years and still not used it and i solder quite a bit
http://www.google.co.uk/products/cat...ed=0CDkQ8wIwAQ
shame you dont live near me, i could give you loads of solder, got about 10 tubes of lead free and a massive role of 60/40