That's a nice looking rifle - you must be very happy with it!
I'm not a P14 specialist but my understanding is the easiest way to work out if it went through the Wheedon Repair Standard process is to see if the volley sights are there. If they aren't, then it went through the WRS process.
Ian Skennerton's SAIS guide (no. 10) to the rifle indicates pretty much all of the P14s went through WRS at the start of WWII, as I understand it.
The guide also notes there might be a star with a letter above it stamped on the rifle somewhere (it doesn't say where) indicating where it was upgraded to the Mk I*/WRS configuration.