Congratulations, you passed!
Sure, you need to do a quick flight to demonstrate what you missed, but hey, it's as good as a pass.
You no doubt have more hours to do on the way to your CPL (if that's what you are up to) and the additional half hour will still go towards that in your logbook, so no loss really. Why not spend most of that extra flight under the hood to better prepare yourselves for the perils of VMC into IMC under PPL as per the other thread re YCAB? Further education can only ever be a positive thing!
Easy!
(and that's how to turn a negative experience in to a positive one)