In some places you can show up with a police escort and just start taking their stuff until the estimated value is enough to settle your debt. i.e. you can foreclose on them.
https://www.yahoo.com/news/articles/bank-america-foreclosed-...
(Consult a lawyer before trying anything like this)
You can't do this physically do this yourself in the UK (AFAIK at least), but I've heard of people taking businesses to the small claims court in the UK, getting a default judgment because the company didn't bother showing up, then when the company refused to pay the settlement, they got the court to freeze their bank accounts and appoint a debt collector to recover the money.