Thanks Roy
So with the kids in bed and wife on a night shift I was able to make some progress in the comfort of the kitchen tonight. The frame was in pretty good shape when I bought it so it only needed a light going over with a fine scotchbrite pad before cleaning and applying the decals.
I decided a long time ago that despite being a bit scuffed, the original Merlin decals wouldn't be replaced, although I have touched in some of the worst bits. I've attached Track 2 decals to the forks and Kona decals to the top tube, both in colours I've tried to get matched to the blurry image from the 1990 catalogue. After a lot of discussions it was thought that the TBG decal might have been on the head tube as with other Kona's of the year but having seen pictures of 1990 Brodies with the TBG decal on the seat tube, I decided to leave the original Merlin head tube decal in place and attach the TBG decal to the seat tube.
As usual, apologies for the photo quality......