Have you contacted DPD for an explanation of the €1.15 VAT on their custom's brokerage service?
Coincidently I had a parcel from Hattons delivered by DPD last week. I was charged the same €1.15 VAT by DPD for DPD's own customs brokerage service - I've just raised a query on the VAT for the customs brokerage service this morning, so we'll see.
It's not much, but every little helps as Tesco says