Cherry Red’s Soul Time imprint is on fire!  The crate-digging team there unearthed two box sets’ worth of R&B rarities in the final months of 2017 that we’re happy to spotlight now! Mr. M’s Northern Soul 1974-1981 is a 3-CD set celebrating the “oldies room” at the Wigan Casino, the late, fondly-remembered club in Wigan, England famous for its northern soul all-nighters held each Saturday from 2 a.m. to 8 a.m. Sunday morning.  Mr. M’s was born out of necessity in 1974, a “club within a club” created to alleviate crowds and…