The cat has witnessed half a dozen government leaders arrive and depart, welcomed world leaders and princes at the iconic entrance of No 10, and is shortly set to become the most enduring uninterrupted occupant since Pitt the Younger.
While the scene of UK government has transformed significantly over the past 15 years, the feline has remained a comforting constant. His lasting appeal - the kind that many leaders would desire - is now showcased in a upcoming TV program exploring the country's affection for felines.
"The cat is certainly the character to meet at Downing Street," commented one political insider, adding that he "has the freedom of the residence."
The tabby, whose formal designation is Head Cat of the Government at 10 Downing Street, was adopted from an rescue center to tackle a rodent issue. His journey from homeless cat in south London to official resident represents a true humble beginnings story that outshines many political biographies.
When strains ran strong during the political partnership, former Prime Minister the ex-PM was keen to dispel any suggestions of animosity between him and the country's new beloved cat. "This rumor is I don't love the cat - I certainly do," he announced during one government meeting.
Now a more recognized presence, the cat appears fully accustomed to the attention. Often spotted on live TV lingering calmly by the front door, his relaxed demeanor in front of cameras has become somewhat troublesome for the Downing Street gardener - he frequently visits the front garden to relieve himself.
His official description describes the elderly tabby as spending his time welcoming guests, inspecting protection measures, and testing historical furniture for napping quality. His day-to-day duties include considering solutions to the rodent occupancy in the residence.
While the cat is the initial to hold this particular position, felines have been accepted in the halls of power for at minimum a hundred years. "Consistency is an essential part of the cat's attraction," explained one expert who has researched human-animal connections.
The cat has an acute sense of official occasion. "The moment something occurs on the road, particularly an formal visit, like routine, he'll be outside the front," remarked a Number 10 insider. "He loves the attention."
Former American President Barack Obama and Ukraine's leader Volodymyr Zelenskyy are among the world figures he has charmed. However, not all leaders were similarly fond.
"The former PM notoriously hated him because she was a canine lover," explained one photographer who has seen several politicians attempting, and failing, to pet Larry.
When he isn't walking the pavements, his regular resting places include the printer and desk organizers, but his preferred spots are on the ledges on both sides of the front door.
The cat's appeal with the people remains undeniable. There are various social media profiles devoted to the nation's chief mouser, including one with more than eight hundred sixty-eight thousand fans. He also receives fan mail, toys, and treats from across the globe and has lately been featured in a book about government pets.
As top feline, Larry naturally receives his share of complaints. One political commentator recently called Larry as "too overweight and too idle to really perform his duties," claiming him of being "support dependent."
In response, insiders near to the cat have issued a stinging response. They explain that Larry is not at all government paid for, with Downing Street staff willingly paying his costs.