To make someone bankrupt you must be owed one of the following:
at least £5,000
a share of debts that total at least £5,000
You must provide evidence to the court that you’re owed this money. There are 2 ways to do this.
If you’ve issued a statutory demand (a request for payment) to the debtor, confirm that you did this by filling in a certificate of service (form N215).
Alternatively, get a sheriff’s or bailiff’s statement showing:
you got a court judgment for the money
the sheriff or bailiff could not recover enough assets to pay the debt