I've been employed by my ftse 100 company for approximately 14 years. Our payslips are complex with overtime, benefits, car allowances etc but I noticed on a yearly statement I have received £600 last year. On further investigation of the payslips it appears I've been being paid a £50 allowance monthly for additional responsibility. About 1%ish of salary so I didn't notice a huge amount going into my account.
I've informed my line manager that I am receiving this payment and to my mind shouldn't be as I've no idea what it is for. I assume he will discuss with the elusive HR team.