OK So the steps I have taken so far are:

1. Sanding the bejesus out of the Body 180 grit to get some machine marks off, 240 grit down to 400 grit
2. Filling the grain with timber mate (made into a slurry and let harden for more than 24 hours)
3. More sanding to 400 to make nice and smooth
4. Painting with a spray primer (2 coats)

Issues I currently trying to solve:
After I sprayed on the primer I noticed cracks starting to appear in the edge(see photo). Before spraying I had thought these just lighter scratch marks in the wood.
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Currently I am thinking of trying to scratch off the primer and filling these cracks with timbermate (maybe trying a bit harder to force the paste in) then sand and primer again.

Actually the primer I was given ended up being orange as well (thought it was going to be white but didn't think to check before given it a good old spray). Am not sure if I will put up with this and change colour (I was thinking a yellow before I started) or strip back and get the correct colour primer for Daphne Blue.