Bees
Contrary to popular belief bees aren’t protected and can be treated, however, they are endangered so we’d always recommend exploring all other avenues before considering eradication.
The decision to treat will depend if it is possible to close the entrance(s) to the nest after treatment, and if there is a risk to humans and pets. In this circumstance Evolution Pest Solutions have the knowledge and have access to a range of professional use insecticides which are not available to the public
Post-treatment requirements will vary depending on the species of bees you have. For bumblebees and tree bees, blocking up access points will prevent non-target bees from entering and getting contaminated, as well as shortening the likelihood of other bees accessing the same area in the future.
For solitary/masonry bees, in the long-term, re-pointing with sound mortar is the only answer. However, this must be thorough as bees hunting for a nest site will soon locate areas that have been missed.
For honey bees, it is essential that entrance points are blocked off, and if possible remove all the honeycomb. Failure to do this will cause robber bees to find the infected honey and take it back to their hive, thus contaminating it.