Rubber Export Coupon Malaya (1922-42) - the B.L.&P. Conundrum

Not sure how many folks here collect / study rubber export coupons of Malaya (1922-28 and 1934-42) ... but this is our blog entry on that mysterious location called B. L. & P. 
State/Location of issue are often inscribed on the coupons, but there is an area labelled B. L. & P. which has baffled collectors for many decades, speculation and theories are abound, none proven thus far .... and we believe that we've cracked it. 
Enjoy the read and feedback welcome.