Have worked for the same company for just over 20 years(royal mail) can provide a screenshot of payslips, photo id etc. to anyone interested in the deal.
Have also recently been promoted to a management position and due a nice big bonus in June payslip (max 12.5% of annual salary) so repayment will be no worries.
You should have no problem going to HR and getting a payroll advance then. No need to bother strangers on the internet.