This is part of the Public Health (Control of Disease) Act 1984, sections 33 and 34: Public Conveyances. The taxi driver has a right to refuse anyone who may have a notifiable disease, or they may elect to transport you and then immediately disinfect their vehicle (unlike a bus driver, who must refuse you altogether)….
The head of said whale, however, belongs to the King. This law dates back to 1307. The original law read something along the lines of “The King shall have throughout the realm, whales and great sturgeons taken in the sea or elsewhere within the realm, except in certain places privileged by the King.”
This is part of the Public Health (Control of Disease) Act 1984, sections 33 and 34: Public Conveyances. An interesting discussion regarding this law (and a few others) can be found here.