From the NPPL website:
"JAR-FCL PPL (A) or UK PPL (A) to NPPL (SEP)
The holder of a JAR-FCL PPL(A) or UK PPL (A) with SEP class ratings who wishes to obtain a NPPL (SEP) shall:
a. Produce the JAR-FCL PPL (A) or UK PPL (A), which includes evidence of validity;
b. Hold a valid NPPL Medical Declaration or JAR-FCL Class 1 or 2 medical certificate.
It should be noted that any additional ratings attached to the JAR-FCL PPL (A) or UK PPL (A), such as the Night qualification or rating, IMC or FI rating are not transferable to a NPPL and the holder’s privileges will be restricted accordingly."
Yours is a very simple application which NPLG Ltd will process very quickly. However, until then you are effectively in the same situation as anyone else waiting for the CAA to issue a licence - you can only fly solo under the supervision of a FI and cannot fly as Commander with passengers.