The left signature on the second row is most likely Phil Dunn (Red 9 in 1969). I have a copy of his signature and its pretty close. The one on the image isn't as 'tight' as the one I have but perhaps it was made after a bit of lubrication? Phil's role in the Arrows is quite unique. He was (to the best of my knowledge) the only non-RAF pilot to fly with the team, being the RAAF exchange instructor at CFS at that time. RAAF exchange QFI's to CFS during that time served on either CFS 2 Squadron (JP) at Rissy or CFS 4 Squadron (Gnat) at Kemble. One of the 1969 team was killed during a practice on 26March 1969 which would have been during the team work-up phase prior to any displays for the season. Phil got the gig (presumably) to fill the vacant slot because he was a current A2 QFI on the Gnat, on-site at Kemble where the Arrows were based and had flown in a RAAF F86 Sabre 4 ship display team back in OZ in the early 60's.