I don't really know what's available in the UK, but there will be a trade off between the cleanest cutting and the longest lasting. A Hi-ATB grind is the cleanest slicing, while a triple chip grind (TCG) gives longest edge life. A standard ATB grind could be a good compromise. If all else is equal, more teeth gives a cleaner cut, but also poses more resistance and higher rate of burning. Since your saw is a slider, it'll be best to use a saw with a low to negative hook angle (from any negative hook angle to ~ +5° should be fine).
Stick with a good quality name...the odds are in your favor if it's made in Germany, the UK, Israel, European Union, the US, Canada, Japan, or Italy. If it's made in China, it might still be a good blade, but blades are generally made there to cut costs, not to improve quality.