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I've got it on a rosemary in my front garden, which has a lavender hedge on 3 sides...I have read it likes lavender too! What can I use to get rid of it?

From RHS

"Rosemary beetle can be controlled either with insecticides or hand picking of the adults and larvae. There are no recommended insecticides that can be used on rosemary if they are to be used for culinary purposes. If pesticides are used then these are best applied in late summer to early autumn or in the spring, when the beetles and larvae are active on the plants. Suitable insecticides that can be used include bifenthrin or imidacloprid. Insecticides should not be used while plants are in flower because of the danger to bees."