Ooohh look what a little bit of Wilko Teak oil has done! I just slapped some of this over the cabinet without even cleaning it up and it's made a world of difference, the photos don't even do it justice. I'm pleasantly shocked, even the remaining light marks on the top (looks like a tyre was sat on it) will probably come out with a little careful abrasive work.
That's my mind made up, there's some very tatty/damaged '70s stuff in the conservatory that I also had for parts & they will be dismantled and relegated to the garage whilst the RG cabinet comes indoors and the set receives some attention.