Gifts to go with bouquets in London: chocolate, a card, a candle
Gifts to go with bouquets in London: for most of the year the weather here is kind to chocolate, with a July afternoon at around 24°C. On a scorching July day the city reached 40.2°C, above the 34–38°C at which cocoa butter melts. How London's weather treats the flowers is a separate question. What is worth adding to the bouquet comes down to what the recipient does with it once the doorbell has rung: eat it, read it, watch it or leave it standing in the room.
Something sweet or something on a ribbon for the person at the door
Chocolate, a marshmallow bouquet, a foil balloon and a soft toy are the gifts to go with bouquets in London. They go into the same basket at checkout and arrive with the bouquet as one order.
If the chocolate has softened on the way and set again, a pale bloom can appear on its surface. That is the cocoa butter's structure settling differently as it cools, not the chocolate going off, so there is no need to send it back.
A marshmallow bouquet can go in the same order as the flowers.
A foil heart on a short ribbon takes up one hand, which leaves the other free for the bouquet resting on a lap or across an arm. A soft bear asks for nothing more than a seat on the sofa once the flowers are in water.

A card carrying your own words costs nothing extra. A printed greeting card earns its place once the design matters as much as the words, or add a topper.
The courier hands the bouquet over in person, card included, and says nothing beyond what the sender has asked for. All the courier knows is the recipient's name and address; whether the card carries a signature or stays blank is entirely the sender's decision.
Entertainers are booked onto the same order.
For a restaurant or an event venue, the timing is agreed with the venue's staff beforehand. The bouquet then lands at the right moment: with dessert, with a toast, or as someone steps onto a stage.
The florist photographs the finished bouquet before the courier sets off, and most orders are handed over on the day they are placed; in central London the delivery itself is free. Zones and rates for flower delivery with gifts in London are worth checking before you pay.
Reeds that work for weeks, a candle for the evenings
Turning the reed diffuser's rattan reeds over every few days keeps the scent fresh. A bottle lasts anywhere from a few weeks to a few months, depending on its size, the room and the number of reeds in it.
A decorative candle sits alongside the diffuser rather than instead of it, something to light in the evenings once the bouquet itself is long gone.

If you know the person but not the gift, start with Gifts by recipient, sorted for a mother, a man or a child. Or choose a printed greeting card when the design matters as much as the words.