更换汽车保险在保单失效前最好书面通知保险公司要取消现有保单并拿到保险公司的书面确认。确保新保单在旧保单失效前生效（如果有车贷，最好提前几天，以便有足够的时间准备 certificate of insurance）
如果是在网上renew road tax
至少提前三天：
If you are renewing your vehicle road tax via digital services, you need to buy your motor insurance at least 3 working days in advance.
If you are renewing your vehicle road tax at road tax collection centres, bring along either your original certificate of insurance, electronic certificate of insurance or cover note.
来源：LTA onemotoring
If you are renewing your vehicle road tax via digital services, you need to buy your motor insurance at least 3 working days in advance.
If you are renewing your vehicle road tax at road tax collection centres, bring along either your original certificate of insurance, electronic certificate of insurance or cover note.
来源：LTA onemotoring
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