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"The way that this is written, it basically would prevent development of all rodent models," except perhaps those that exclusively use a wild-type virus or toxin.

Social media posts from residents of Bosnia and Herzegovina's capital have shown an abundance of rodents swimming in the Miljacka river which flows through the centre of the city.

It is also fitted with three cameras and stocked with food, as a way to capture the almost-royal rodents' movements.

But nothing could have prepared Chris for the "surreal" impact the rodent would have on his life, eventually leading him to the woman he will soon marry.

Patricia Page, owner of a pest and rodent control business in the north west, said it appeared a large colony had set up home on the quay, adding it is a real "cause for concern".