that's a very big swarm on bees
yes quite a few indeed.and rare nowadays due to varroa mite arrived in the country a few years back sadly which has spread and now almost killed of the wild bee population entirely.and infected most domestic hives also.
that sounds very badly
Yes not good for the poor bees.Domestic hives can be treated with certain chemicals but the wild bees have no defence.
I know .. it's really really bad