I can only speak from personal experience this year...
I think they done really well amongst the chaos! My ring pad and a DVD set I ordered at the weekend have arrived. And my eBay buyers echeque cleared Monday morning. so I dispatched the parcel immediately sign for, and that arrived yesterday!
My posties here are lovely. As is my Hermes delivery guy. They are always helpful and friendly. I've been impressed with my Christmas deliveries. Everything came quickly.