If we're aiming to restore Britain's glorious past, I vote we restore the Anglo-Saxon kingdoms, I'd happily join the forces of Wessex against the East-Angles.
The big problem we have is there's certain carbon stores that are likely to initiate a runaway greenhouse effect if we reach the tipping point that starts to release the like the Arctic tundra.
The honest assessment is that we're in the early stages of another mass extinction event, the discussion is whether it'll be a Permian-end level mass extinction (95% of extant species) or Devonian-end level extinction (75% of extant species).
Doubtful, most common meal for peasants would have been a sort of stew of vegetables and oats called pottage.
A whole chicken would have been prohibitively expensive either to purchase or in lost money from sale at market, same for pork or beef.
Fish though would be plentiful and cheap and a valuable source of protein. Oysters were considered peasant food until pretty much the 20th century.
Wheat bread similarly would have been a rare luxury, especially made from refined white flour, rye and buckwheat, roughly ground would be far more common.
Typically living in the most rundown, shithole of a housing estate, rusted washing machine on the lawn, cracked and broken render despite the place only being built 4 years ago, rubbish everywhere, portly 50 something man in the doorway at 2pm on a Wednesday having just got up from the previous night's special brews in front of GB News, unlit but half smoked rollie dangling from his lips as he sneers at the non-white Amazon driver who delivers his next pack of red markers so he can draw another st George's cross on the mini roundabout at the entrance of the estate and stick it to the wokes.
Interesting fact, the same man, Thomas Midgely Jr, invented both tetraethyl-lead as a fuel additive and CFCs, almost killing everyone on earth twice over.
Karma got him in the end after he got tangled in one of his contraptions after he became bedridden with polio and died of strangulation.
Love John Wyndham