Do it on line yourself. HMRC site and follow instructions.
All you have to do is key in the details confirm and hey presto the information is recorded and you can just print this screen to use as a payslip.It tells you, you can so why not.... £21.60 to do a payslip, when it takes what 5 minutes to do it this way? Your accountant isn't the mug here

, but then I guess you asked for it to be done.
Why do you think you are being ripped off by the accountant? What have you been told by someone else?
£450.00 is an ok figure, but dependant on what sort of set up you have.
If the accountant takes 10 hours to do your figures etc £45p/hr is a good hourly rate for accountancy.