In theory you have until the end of this month to complete your CPL training, test for it, and to apply for it. If you have already started training, this -might- be possible but I imagine it will be highly unlikely.
If you are unable to complete your training, you will remain as a PPL/IR. If you wish to complete a CPL at a later date, you will need to sit all of the CPL exams again. This would limit you to only ever being able to be a CPL/IR and you would never be able to "unfreeze" to become an ATPL holder. If you wish to be able to complete your ATPL at a later date, you will need to complete the ATPL exams again. There may be some small reduction in requirements due to the fact you have a current IR. For example if you had a CPL but no IR, when you resit the ATPLs you are exempt from the VFR Comms exam. I don't know what the exemptions might be, if any, in your case, without looking it up however I would recommend referring to CAP 804 in the first instance.