I absolutely love using British-grown flowers, so much so I have started my own micro cutting garden (@woodshillcuttinggarden). Firm favourites include antirrhinums, cosmos, larkspur, ammi majus, daucus carota, calendula, nigella, roses, lavender, sweet peas, scabiosa, dahlias, zinnias, salvias, clary sage, just to name a few. There are local flower growers everywhere, many of whom are florists too, so your best starting point is to head to www.flowersfromthefarm.co.uk to find your nearest and see how they can help.