Then do an extra 25 hours before or after the CPL course - the CAA require 200 hours to issue a CPL, and it's up to you how you get to that. Other posts point out that the majority of people starting a CPL at exactly 150 hours also intend to do an IR before sending the paperwork in for licence issue, which brings the TT to over 200h.
If you don't have a CPL on your licence does this mean you are still a PPL licence holder? even though the same school know you have passed the exams and skills test for the CPL?
It's not up to the school - it's up to the FIE who conducts the FI skills test. He will check your licence as part of the test, and you can present him with either a PPL and do the test as a PPL holder, or a CPL and do the test as a CPL holder. And yes, if you do not have an issued CPL then you can only exercise the privileges of your existing licence, ie PPL.