Pests & Diseases
Imagine having a bug the size of a dinner plate on your back, that bores a hole into your back. The bug then sucks out your blood and spits back blood and possible infections from someone else into the hole on your back. Nasty
That's Varroa. You must be able to manage varroa in your bees if you want to be a beekeeper.
Keeping bees is like keeping other animals. You are responsible for their well-being and must be aware of how to keep them healthy.
Also, there are many other diseases of honey bees. Some of these are 'notifiable', like other livestock disease.
DEFRA maintain a national system of inspection and advice to deal with this, called the National Bee Unit. Your local association will also be able to help. The two work closely together.