In Expenses > Expenses > Unpaid Expenses, you can set a payment date in advance. If the payment date is a bank holiday, you can ensure correct payment by setting up a general rule and deciding if you want the system to make payments on the date before or after the bank holiday.
To do so, go to Expenses > Settings > General; you can select your setting in the box Settings for bank closing days. You can choose if the payment should happen,
The day after a bank closing day
The day before a bank closing day
Your selection will be saved immediately.
Example
You have chosen 24 December as your payment date. If you set the bank closing date to the day before, the payment date will be 23 December (if it is not a bank closing day), and if you set it to the day after, the payment date will be 27 December (if it is not a bank closing day).