Yesterday I spotted this in disturbed ground near the new ferry terminal:
Here is a leaf:
and flowers and fruit:
I haven’t fully made up my mind which rocket it is yet, but whichever it is, it will be new to Raasay, the vice-county and a good chunk of NW Scotland. It will presumably have come in with grass seed or straw. The seeded grass areas are on my list to see which grasses are in them as they flower.
Later: both I and Tim Rich, to whom I sent photos, are pretty sure it is Sisymbrium altissimum (Tall Rocket). Ripe fruits should settle it, if it survives.