It’s ”The Bachelor” — in breeches! PBS has snagged the rights to a reality show sure to make Mr. Darcy fans swoon. Already a modest hit in England, ”Regency House Party” (which will air this November) follows 12 modern-day single Brits who must pitch woo a la Jane Austen, flirting and scheming their way into advantageous relationships according to early-19th-century rules. And yes, there’s a ”bed checker” to prevent any 21st-century-type hanky-panky. ”House Party,” which comes from the folks behind the net’s time-traveling ”House” series (most recent: the 1628-set ”Colonial House”), ”is more fun and frolicky,” says executive producer Jody Sheff. ”Instead of putting families into dire-straits situations, this is more about ‘Can these singles hook up and actually survive in the summer of 1811?”’ Call it the summer of very proper love.