Email your HR department
Email HR, they legally have to keep your payslips on file for a certain amount of time after employment ends. They should also email you your p45. But also, if you have an HMRC account, you can see all of your pay for the financial year on there.
Ask them
I went on to the HMRC page and this is what it’s brought up
I have no idea how to contact the hr I’ve asked for their contact information before and my boss said he didn’t know what the email was for them ..
What company do you work for? Are there any details in your contract/employee handbook?
I would email HR/ payroll dept and request them x