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Using your Royal Mail tracking number at https://www.royalmail.com/track-your-item you'll have several delivery options if you're not going to be in, such as:
Although Royal Mail are an excellent delivery service overall, like any other service they experience occasional delays or strike action, and if your test is time-sensitive, we'd recommend you order in advance in case of any delivery delays - if there has been a delay this is generally resolved within 24 hours and you can check your Royal Mail tracking information for the latest updates.