Thanks for the suggestion, John. Gibson have confirmed that it is a Les Paul Junior Special Plus even down to to the colour and hardware (I didn't tell them any of that info - they came back to me with it!). So it seems it is original and genuine - I was getting a little worried with the flood of fakes on the market. There must have been a change with the later ones as I have seen 2 others and they are slightly different. But it wouldn't be the first time Gibson (or most other guitar manufacturers) have changed specs mid stream.
Thanks everyone for your input and help
