Operation Vegetarian remains a deterrent

Would a delayed war make Britain's Operation Vegetarian biological attack plan more likely?

No. The stockpile and plan were intended as retaliation to deter Axis use of comparable weapons.

Britain maintained a very large biological-weapons stockpile during the war. Germany and Italy were warned that any first use would bring a total British response with the available weapons. That threat created a form of mutual deterrence before the nuclear age. The delayed-war premise does not supply a reason for Britain to abandon the retaliatory condition and initiate the attack.