Okay the answer is yes it is only £33 to pay and you can cancel the subscription, therefore every black friday I can just manual renew it for half price
There is no half price sale that I am aware of only a 30% off 1&2year subscriptions which would be roughly $75-100 a yr depending on your currency and is only available to current subscribers this time around.
You can cancel auto renew at any time in your account settings....auto renew usually renews based on your last subscription purchase.
If you have a subscription with saysa month left come a sale time you don't need to cancel auto renew, just purchase your new subscription and it will add on to your current one and will not auto renew till that subscription is done