A bulk user like DVLA will get preferential rates for mail but first class will still be a lot more costly than second. I don't think they could cost justify using first for routine correpondence. If they contract mail to a bulker such as TNT which using the PO to deliver delay may be even longer - stuff from my bank routinely takes 7-10 days.
I work in gov department but not transport. Second class is default except for 'just in time' meeting papers etc.
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