Missing mortar, bricks and tiles allow access for cunning nesting creatures, which can cause various problems even if only due to noise.

If you need to exclude mammals, birds or insects, please try to fit artificial habitat to mitigate the loss.

• Bird spikes to window ledges, rooves, antennae.
• Solar panel mesh to exclude birds and squirrels.
• Chimney cowls.
• Eaves holes sealed to prevent access into roof space, with mortar or mesh.
• Soffits repaired, pointing work.
• Guano shelves.

I don’t use poison or kill anything.
Active wasp and bee nests are best referred to a specialist.