Bookeeper Ad-Hoc Project - Calcualte my new annual salary for LY

Hi There,

I work for limited company in London. Today I found out that because of the mess with the CoronaVirus, My employer has made a mistake and forgot to add the bonus payment for last year to March 2020 payslip (This is last the payslip of the financial year for 2019-2020 because the financial year of my employer runs from April 2019 until end of March 2020).

To be honest, I don’t trust my employer very much and I want someone to calculate how much is the new March 2020 payslip supposed to be , including the bonus of the 4 extra salaries. So instead of getting 12 salaries for 2019-2020, I am supposed to get 16 salaries for the entire year.

To give additional information :
1. During this period I didn't have any additional income.
2.I'm also no married and have no children and live in London.
3. My tax code is 1250L

Is there any other additional information required to calcuate my last payslip?

I'm adding the following docuemnts:
1. My payslips for the entire financial year of 2019-2020 in one file.
2. The last payslip of the financial year 2019-2020, March 2020.
This is the payslip I need to be recalcuated with the bonus payment.

Many Thanks,

Stan