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My Boss owes money but I am named on letter from debt collection agency (UK)
I would not be overly concerned unless they started contacting you directly on your personal time or it showed up on your credit report.  It is very likely that you are listed simply for their own records. This is correct for them to do, since you spoke to them in the past as an agent of your company. There should not be any legal connection to your personal finances.  If it continues to be a concern, I would question whether I wanted to work for such an employer. I do not know your entire situation, but this kind of misbehavior is a red flag if not addressed.