Thanks gents. I did register on the site shortly after reading this thread. Had a good look about for a rod and sling. It has the firing pin, an extractor and the third peice that looks like a thick firing pin wrapped in wax paper. Then there's the odd key... white metal and looks like a sight adjustment tool with two prongs on the end, but not for this rifle to be sure.
The plug mathces the stock perfectly and is well covered with that gloss finish? Strangely, the trigger is very crisp too.
The dog is a GSD and from Germany too. That's only half her nose, she has a large chomper. Yes, she's been duffle cut too, about three inches off her tail but that's another story. Luckily, she had a freakishly long tail to start with so it now appears more or less normal.