Ganger vs Armstrong

The following "Spot the Continuation" position was given in the July 2011 edition of the British Chess Magazine. Black has just blundered with 45...Bc3? Can you find a strong move for White?

5k2/2r1q3/2p2pQ1/1pP1p3/1P3PBP/2b5/3R2K1/8 w - - 0 45

I.R. Ganger vs W. Armstrong