Cor blimey! (2,4)
I think it could be either:
stone the crows
(Other definitions for by jove that I've seen before include "Surprised exclamation" , "Old exclamation of surprise invoking Jupiter" , "Good God!" , "Well, I'll be blowed!" , "Well, I'm blowed!" .)
(Other definitions for stone the crows that I've seen before include "Good grief!" , "My goodness!" , "Chesterton sow (anag) - expression of amazement" , "Expression showing surprise" .)