No. That’s worked fine. With live unwrap off I moved those errant vertices off the map then turned it back on to select and hide everything ‘ok’. This enabled me to see what objects those vertices were connected to. The really long ones were the cylinder end caps from my cables I’d not unwrapped.

Nothing seemed too important so I deleted them and then selected all and did an fresh average island scale. That gave me this but highlighted more issues… looks to be caused by the knee wire, the bundle of exposed controller wires and the inner thumb.

I saved clean version of this model before I started this so I can mess around to try and diagnose the problem(s). Any clues from this info as to steps I should take? I’m sure all my curves are converted to meshes but I’ll double check. I didn’t explicitly unwrap some of the cables and wires as I thought I would just use separate plastic materials for them.