Cpc and trailer

My apologies as I am sure this has been spoken about previously but I do find it difficult to navigate some of these forums.
I occasionally drive a ford transit van (2.8t) with a trailer fitted and deliver goods around the U.K. I do this for about 2days every 3weeks or so.
The vehicle is fitted with a digital tachograph which I have a digi card for.
My question is as I assume you will already know is do I need to undertake a CPC in order to continue delivering these goods wi to a trailer.
It’s not my first job but I do get paid for the work.
My assumption was that I only needed to do CPC if I drove a lorry or a bus.
Any advice would be a great help. TIA.

Driver CPC needed if the towing vehicle is more than 3.5 tonnes GVW

Thankyou