I can't seem to find that one on eBay but livestock are on their restricted list, live insects are allowed but the rules infer that they are for bait or feeding purposes. If you are not happy with the listing you can report it and they will remove the listing if your complaint is upheld.
I do agree with you though, if the listing is as you have described it does smack of irresponsibility. The only thing is there doesn't appear to be anything stopping a person buying a nuc of bees mail order with no experience or training.
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Though pets and most other live animals can't be listed, there are few types that you can sell.
Restricted
The sales of the following animals are permitted, provided that the seller guarantees in the listing that the animals will be packaged safely and posted via next day delivery.
Live bait (minnows, shiners, earth worms, and meal worms)
Live insects, crickets used as bait or feeder food for pets
Shellfish, such as crabs and lobsters, that are live when sold but intended for human consumption
Aquarium or pond fish, snails, tadpoles or similar creatures
Hatching eggs for some animals are permitted provided the seller offers domestic-only shipping within the UK. However, hatching eggs from endangered species, migratory or wild birds, snakes, or turtles aren't allowed
Not allowed
Sales of other animals not listed in the exceptions above
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