The Bacterial Reaction Centre (BRC) has a complex electronic excited state, P*, that evolves into subsequent charge separated product states P+H and P+B. Pump-dump-probe spectroscopy on the wild-type BRC and on YM210W, a mutant with a stabilized, long-lived P* excited state, has uncovered a new charge-separated state in both BRC's. When P* is dumped, a fraction of its population is transferred to this state that has a strong Stark shift in the accessory bacteriochlorophyll (B-M) region which serves as a signature for P+ and a lifetime highly comparable to the slow phase of P* decay. This lead us propose this intermediate to be P-1/P. (C) 2009 Published by Elsevier B.V.