How can get my customers / clients to pay quicker?

An all too common problem. Invoice as soon as possible. Chase the debts as soon as they are due and don’t be fobbed off with excuses. Remember, credit control doesn’t start after you’ve sent out the invoice. It starts long before then. Make payment terms clear from the outset and on your invoices and statements. Some customers don’t pay until they receive a statement so send them promptly.