If Tesco needs character witnesses that Broadcom has done this to many other customers, I think they’ll find plenty of willing participants.
Broadcom’s marketing for Proxmox is extremely effective.
It’s ok, UK courts are mainly rigged and likely to favour a home company over a foreign one (see Tesla v bbc as an example).
Unlike USA, we don’t have Juries for corporate cases and generally filings are private so the Judgement can say pretty much anything….
Looks like proxmox has well-fleshed-out documentation for migrating from vmware:
"Although it was written with VMware as the source in mind, most sections should apply to other source hypervisors as well."
https://pve.proxmox.com/wiki/Migrate_to_Proxmox_VE