I loved my Flash but its braking was purely decorative and it's vibes after 50mph helped the fuel consumption by keeping you below that. To use the centrestand it was best to roll the rear wheel onto a two inch block of wood first to avoid a pulled back muscle, or ten.

Both by A50s were immensely boring! And a bit plain.

Very pretty though: BSA certainly knew how to make a gorgeous timing case on both the B31/33 or A7/10. The unit twins don't have the same effect on the eye - well, not to me.