If my insurer didn’t support me in a case like that I’d be getting it fixed and taking them to the small claims court.
They’d love it if you did. What were you going to sue them for? Breech of the contract you entered into specifically omitting damage to your vehicle from your cover by taking on a cheaper premium?
Even judges deserve a good laugh now and again.
In all seriousness, if you got the Reg, then write to the MIB (or ring them) as whilst they won’t deal with your claim as such, (ie they only deal with uninsured/untraced claims) the MIB in the UK also acts as a central point of reference, where they can and will trace via the reverse Romanian version of the MIB, the insurers of the lorry, and more importantly, the UK handling agent of the lorry insurers.
https://www.mib.org.uk/ and don’t use anyone else or any other similar looking link, there are claims management companies who pretend they are the MIB to get your business.
You can therefore bring a claim, in the UK, against the lorry drivers insurers, and deal in English, with a UK Insurer or Claims Handling office.
Chances are it will be a department within Aviva, Zurich, Allianz or an agency like Van Ameyde.