Lavenders like a well drained sunny spot, feed with bonemeal, plant the tough ones or if you want a lower one then Munstead is a good variety, clip over lightly when the flowers fade but don't go into the old wood.
Good herbs golden oregano looks lovely, purple flowers great for bees and can be used instead of marjoram as well, Sage 'tricolor' again looks prettier and not so vigorous, variegated thymes again in a nice sunny spot again good for bees, parsley in little clumps in the border the bright green goes brilliantly with the pale blue lobelias or orangey marigolds garlic chives with their graceful white flowers, normal chives ,and don't forget edible flowers like nasturtiums, pansies, hemerocallis (like sweet lettuce) borage essential for a proper Pimms, and at least one rugosa rose for petals (candy them in sugar syrup then dry until crunchy) and edible hips....real rosehip syrup is great for soothing sore throats, lots more multipurpose plants out there...