Not entirely sure WHERE to post this, as I don't know what's in them, but what on earth are these? The bits that look like lids are the bark from the branch - The plant itself is healthy. (The plant is in Birmingham)
Both are sap suckers, and can be controlled by systemic insecticides (much more restricted choice these days, since Imidacloprid (various brand names) was linked to bee collapse disorder), contact insecticides (less effective), and biological controls (difficult to be effective outdoors and on large plants).
The birds will, directly or further down the food chain, be exposed to any chemicals you use to treat these infestations. I don't know what to suggest that would be effective and bird-safe.