Ruled and inhabited by the same elites since decades, most machines have never seen this island with their own eyes ... and probably never will in their lifetime. Still, it is the most famous, most prestigious region of the Known World.
The region Regalia (also known as Britain) is home to big, influential clans. It is regarded to be the "Holy Grail" for clans, as many strive to set foot on its shores and build their influence.
Promises of well-developed infrastructure and power, fame, and wealth make Regalia a desirable territory. Establishing themself on this fiercely fought-over ground is considered one of the greatest achievements for a clan.
In reality, the "British Dream" is pretty much a myth; nowadays it is nearly impossible to make any impact on the already existing territories. The clans occupying them have been in charge for so long that their established forces are hard to make a dent in.
Notable Clans

Reign Britannia
This clan is considered the Number 1 not only by its members, but also the rest of the world. Their forces feature highly advanced tech and insanely skilled fighters. Ruling a large territory in the north of the island, they have not only tanks, but also a large number of planes and an entire fleet of ships at their disposal. They are always looking for new members, but getting accepted into the clan is reserved for the most prodigious individuals.
Astra
Having dedicated most of their resources and know-how to research, this clan's strong suit is manufacturing high-end weaponry and parts. Their research facilities and factories, located in the former Wales area, carry the reputation of being awe-inspiring places of tomorrow's technology. They employ a large number of scientists and an equally large number of soldiers equipped with their newest creations. Seemingly content with their territory's extent, they generally stick to defending themselves and exporting their goods instead of conquering.
The idea of the tanks splitting into clans, like in older times in human history, is super cool! I think it's a nice tie-back to the history of our world, your tanks' clans.
I figured it would suit their society well.
Check out The Hummelverse, a post-apocalyptic utopia... with talking tanks!