Yes, there is a spray you can get from any Garden Centre, one that kills off any 'nasties'. However, it's better to keep checking your plants and picking the beetles and grubs off by hand, as any sprays obviously affect other beneficial insects.

Pick them off by hand, they are tricky things as they tend to drop on the ground upside down and seem to become invisible!! Someone on this site recommended holding a small pot under the plant as you look for them, and flick them into it! Sounds a good plan.

thanks guys i have been checking them daily and the numbers have dropped to nearly none