Does HMRC really need to send me 13 copies of the same letter, all delayed in the Christmas post?

I’m in the middle of finalising all of the business arrangements for techPolitics LLP, the new company for my website work. One aspect of that is VAT registration, and my accountants need an authorisation code from HM Revenue and Customs. Rather surprising then to collect my post and find 13 copies, yes 13, of the very same letter, all posted on the same day and all arriving on the same day… and all posted business second class, and hence all very delayed by the Christmas post. 1 copy, sent 1st class, would have been far preferable!