Graduation in London: flowers to carry, to give and to keep for weeks
For graduation in London, 51 Jumilia outlast the day: the bud reaches seven centimetres, white at the base and pink at the edge, and with good care it lasts up to two weeks in a vase. A bouquet like that stays fresh long after the ceremony, while the right choice on the day itself depends on the moment: something to hold through the ceremony, something to give afterwards, or something to set on a table that evening.
Spray roses for the day itself, with one hand left free
When both hands are busy on the day, a large bouquet gets in the way. Spray roses carry several small heads on one stem, so a compact bouquet such as 11 Lavender Spray Roses leaves a hand free. The lavender and lilac tone is in the names of these bouquets; the exact shade shows in the photo the florist sends before the courier sets off.
Anyone who wants more presence can choose 51 Jumilia in Airy Wrapping instead, but a bouquet that size is no longer something to carry through a crowd one-handed. For the ceremony itself, the smaller option tends to work better; the larger one suits the moment afterwards, when both hands are free to hold it properly.

For family handing over flowers straight after the ceremony, a small bouquet works best. Roses bred to open like a peony are usually English varieties, David Austin's among them, or similar breeds chosen for the same dense, many-petalled head. One such bouquet is 15 Peony Lavender Roses.
Real peonies themselves are seasonal rather than year-round: in the UK they are cut from late April to June. Outside that window, a peony-shaped rose gives a close equivalent in form. Anyone whose graduation falls inside those weeks might look at peonies directly, rather than the rose version.

What still looks fresh two weeks after the ceremony
Vase life varies a lot between these flowers. Jumilia holds up to two weeks, roses last around a week, and chrysanthemums run two to three weeks, though their lower leaves tend to yellow before the flower itself fades and are worth trimming away as they go. In Britain chrysanthemums are an ordinary gift, not a flower reserved for funerals.
Lilies should not go to a home with a cat: every part of the plant, even the vase water, is toxic to cats. Indoors, recutting the stems and changing the water keeps any of these going longer. The heating that runs across London from October to April dries the air. A wet walk home is reason enough for wrapping that keeps the rain off (how flowers fare in a London flat).
A box or a basket for the table after the ceremony in London
Sending a box or a basket to a restaurant table skips the vase question entirely. 25 Mixed Roses in a Box needs no container at all, and a basket works the same way. Both hold their stems in foam, which wants watering across its whole surface every day, not just at the centre.
For a restaurant, the time is agreed with the venue's manager, so the flowers arrive with dessert, with the toast or as someone walks on stage, as the delivery page sets out. For a hotel, the flowers go to the room or stay at reception, as the hotel allows; the order needs the guest's surname (hotel deliveries).
Graduation flower delivery in London starts with a photo of the finished bouquet, sent before the courier leaves. Most orders are delivered the same day they are placed, and the exact window for a given bouquet shows on its own page. Timing and zones for a chosen date sit on the delivery page.
Choosing where to start is mostly a question of the moment: roses for something to hold through the ceremony, flowers in boxes or flower baskets for a table set later that evening.