Monarda, 'Beauty of Cobham' - will take quite a bit of shade. Smells glorious. The leaves are used in Earl Grey tea.
Scabiosa #deep #purple #flowers
geranium sylvaticum mayflower - 'Wood cranesbill' Tough bushy upright perennial with violet-blue flowers unsurprisingly in late spring & early summer. Cut back after flowering for a second flush in July-August. 90cm