If you time it right with the jab and leave them for a little bit then you can get lucky and skip them coming back into season. I have a vacced hob now which is fine. I did try leaving them in season but they dropped in condition badly and in the 3 rd year I lost one so wouldn't do that again my self. May be one year on and off might have been better. But vac hob seems the best way though at 75 quid his quite valuable now lol