Just blast it off with a hose ... there will be a Froghopper nymph within the Cuckoo spit ... I don't think they cause any damage to plants.

Not detrimental at all. Treat it as an interesting habit of the immature form of the Froghopper insect.

Thanks, folks here's a big kiss from me X.

Ooh, thanks Treetop! I noticed some of the frothy spit on a Rosemary and a Lavender today ... the forecast heavy rain should wash it off.

Well, Shirley here in Brum at 18.15 we're still waiting for the heavens to open.

Same here at 20.15 ... England v NZ cricket has just stopped due to rain in London so it's probably heading our way soon.

Been raining gently here since half past 6.