QUOTE (barry)
Sent it Royal Mail recorded
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This is not the best method to send the S172 back. The "Signed For" system is open to abuse and many things go missing when it is used. These items are sent through the normal post and are only tracked at the very end when they are delivered. A lot of them that are delivered are either not signed for & just pushed through the letter box, completely dissappear or are not acknowledge at all. The post office does not seem to care if these items go missing either.
Special Delivery on the other hand is tracked as soon as you send it. Every person that handles the letter has to sign for it. It is handed direct to who is going to finally deliver it and they have to sign for it. It is then handed to the person at the delivery address and they have to sign for it. It also has to be delivered next day. And I can assure you that it is very unlikely to go missing or not be delivered.
It may seem that the 2 services are similar but they are completely different. For the information you are sending it is vital it is sent on time and proven to be delivered. For things that you may be relying on in court it is definitely worth the few quid it costs.