In reply to Paul Doran:
It's only scrambling - I don't think it particularly matters what you have on your feet. Either B3s or trail shoes would be fine. I have scrambled in both, but more normally I will be wearing a normal pair of walking boots. B3s are likely to be too hot in summer, and trail shoes might not keep the water out on a wet day, but would be perfect on a dry day.
I don't think I know anyone who has taken rock shoes on a scramble. If you need them, then you have probably gone off route.