I continued with the rivetting tidying up. I drilled out about 6 rivets that were not sitting properly and redid them. The post today brought the last flush rivets I needed so I put them in with great success.
I then scotchbrited the spar and then spidegreased and sprayed the spar again over the rivets and unpainted parts. I then attached the ribs and rear spar to preparer for the skins to go on!