Well it can still be pursued, but after six years of no one claiming to owe the money or they haven't proved it or taken it to court after six years legal action is no longer possible. And its no longer possible to just apply for a CCJ before even making the person you are chasing aware you are intending to take court action.
You can't even make someone bankrupt or get a debt relief order unless you owe one single creditor over £5000 - so most debts below this figure are mostly just chased by letters and phone calls, eventually the debt collection agency archives the debt and another company years later buys it for pennies in the pound and has another go. Most likely when the debt is 5 + years old in a hope to scare someone into stumping something up, by offering 50% off the total amount or asking for a regular payment plan... Once it hits 6 years they can no longer go to court but can still chase.
That's the point of the thread 
