Regarding updating the address with euro car parks, I imagine this is admitting to now having receiving letters from DR+. I’ve not had anything sent to my current address but wondered by doing this, does this open me up to anything?
I'm not sure what you mean by "Now having receiving letters from DR+"
If you don't provide them with your new address, the risk you run is that they will issue a court claim to your old address, which, if not responded to, will result in a default judgement being issued against you and a CCJ appearing on your record, which you would then have to work to set aside.
By providing them your current address, you ensure that any claim reaches you, allowing you to defend it and avoid a judgement in default.
the pub have advised to deal direct with euro car parks
If you speak to the management of the pub they
might not do anything to help you. If you don't speak to them, they
definitely won't. If you have no success with them, try the head office.