Two per passenger!?

Found this on the website of Britain's National Rail. Let it not be said that the UK is pet unfriendly.

Passengers may take with them, free of charge and subject to conditions below, dogs, cats and other small animals (maximum two per passenger) provided they do not endanger or inconvenience passengers or staff.

1. Dogs must be kept on a lead at all times unless contained in a basket.
2. Dogs without leads, cats, birds and small animals must be carried in an enclosed basket, cage or pet carrier. It must be rigid and not open (to prevent escape) and the animal able to stand and lie down in comfort.
3. Animas and containers must not occupy seats, otherwise a charge will be made.

I appreciate the fact that the regulation concerns itself also with the safety and comfort of the animal, by ensuring that the carrier must allow the animal to stand and lie down in comfort. Would my dog be complaining to the stationmaster any time soon?

I suppose the maximum of two per passenger are for smaller animals which may need company eg. guinea pigs. Which is quite kind...

Mental note to self that such a carrier is not currently in the UK and that I should be looking for a suitable container some time soon for planned trips to London.