Suppose one party owes another something (because of contract or tort, I presume the exact reason doesn't matter). The debtor refuses to pay so the creditor instructs a solicitor to send them a grumpy letter, and then they pay up.
Can the creditor still sue the debtor for the legal costs associated in collecting the debt even though it is paid?
Is this something that people do successfully when small amounts are involved? Will courts award the costs of suing as well?
Would you effectively be suing for "zero plus costs"?