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To an extent in relation to the topic here, there are aristocrats who own and live in large listed properties, mansions of historical interest with many rooms, for example 30-40 or more.
They cannot afford the upkeep of the masonry, and receive a 999 year lease from the State, guaranteeing funds for the properties' upkeep and a free and easy life for the aristocrats.
These properties usually have a large land estate attached.
The subsidies mentioned by Gary are privileges for the privileged, ensuring a free and easy life.
Another indirect example is the Duchy of Cornwall, which seems to be tax-exempt, equating to a subsidy.
Somewhere in recent history the aristocracy in Britain assured themselves a free ride, the solution being subsidies.
They have connections to the upper house and the head-family, so it is unlikely their privileges will be questioned as long as the aristocracy has allies in the economic circles of bankers and top chief executives, who also guarantee themselves a free ride.
Much depends on the lower house not wanting to ruin the gravy-train. The idea of being promoted to "sir", "baron" "baroness", or receiving a place in the EU gravy-train on leaving the lower house brings with it a lucrative chance for a free ride till death us fo depart.