This is the oldest evidence of people starting fires

We didn't start the fire. (Neanderthals did, at least 400,000 years ago.)

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[Erbium68]

Great, all we needed was the British thinking they invented fire.

"We" may have invented fire, but our colonial descendants are currently the arsonists.

(400kya I don't think there was an island of Great Britain per se, just a fluctuating landmass more or less covered with ice or connected to the mainland. )

 

[Erbium68]

Astérix!

From googling, it looks like boiled lamb and lamb in mint sauce are actually separate typically British recipes.

I have never encountered boiled lamb or lamb in mint sauce.
English lamb is always roast; beef if tough is occasionally boiled.
Roast lamb with mint sauce and green vegetables is absolutely fine, and some French chefs have said so. Lamb fat is rather greasy and mint sauce (fresh mint leaves ground up with vinegr and a little sugar) cuts through it admirably.

As a separate aside, though, not that many restaurants in the UK in my experience are actually very good at it, in fact my one lunch experience at the Savoy was disappointing. It's very much domestic cooking, and the best roast lamb I ever had outside the home was a small family restaurant in Dijon.