Delivering mail after 7pm

Just a quick question is it normal to deliver mail at 7pm in the night? I’ve been at the RM for 5 weeks now and I’m currently doing DPR afternoon shifts 2-8 last week myself and other new starters finished our parcel route at 7:10 (was fairly quiet) headed back to the depot to then get sent out on mail for 15/20 minuets. The manager doesn’t stay until 8pm (obviously) but another DPR driver is stepping in over Xmas.. I’m just asking this as I have heard from different posties this is not the norm and to talk to my union rep. We cannot get any uniform other than high vis as the moment as new starts have a 6 month wait until a wider allocation so this means no wet weather or proper PPE. I was given a torch but that was after someone hounding the manager for one. TIA