“advice confirms” on my bank statement. what does it mean?

i’ve noticed £250 entered my account under “advice confirms” on thursday, and don’t know where its from. we normally get paid on thursday, only this thursday my manager said there was a problem with the system, and we are going to get it all next week. so where is this money from? i’m not on any benefits, is it possible for my company to have used a different payment method? I wasn’t told anything, and there’s “nil” on this weeks payslip. thanks .