I've been looking high and low on RS for a decent 10+ A 20+ V 0.5- Vf diode and frankly the choice on RS is terrible !!! they do not seem to have much choice in componenets at all ! Farnell seem to have a better search function and more choice, is this just my imagination ? who do you normally use ? who provides the most choice ? its rather difficult trying to design something particular and not be able to find parts that meet your needs is it ?