Flowers, with chocolates, wine or teddy if desired, delivered by a florist, by post or by courier. Indoor and outdoor plants, seeds, trees and small tools.
Arena buy flowers direct from a Dutch auction. They also sell plants, teddies, drink & chocolates. Free hand delivery within M25 or post to other areas.
Flowers from under £10, sent by post or courier. Small number of FairTrade flowers are available. All prices on the web site include delivery. 
Small nursery in Jersey. Hand select flowers and send them by royal mail. Also sell plants, seeds, tools and gifts. Free delivery on everything.
Flowers, house plants, chocolates and balloons posted direct from Bunches. Bouquets from £9.99 including delivery by first class royal mail. 
Flowers usually sent by courier from their premises in Edinburgh, but they use local florists for hospitals etc. Next day delivery included in prices.
A 'relay' florist. You pick your flowers online and they will get them made up and delivered by a florist local to the recipient - worldwide. Delivery usually £4.95
Order online for arrangement and delivery by a local florist in most parts of the UK. Free delivery Mon - Sat. Also sell chocolates, gifts, balloons and hampers
Not the cheapest, but hand delivered by local florists. Same day delivery to 100 countries around the world is possible. Also deliver chocolates, gifts and wine.
Bouquets, sprays and plants made up and delivered by local florists, in the UK and internationally. Same day delivery if ordered before 1pm.
Mostly flowers, made up and delivered by local florists, some with free next day delivery. Also chocolates, bears, hampers, balloons, wine and fruit. 
Work with a network of local florists to arrange deliveries of flowers and gifts in the UK and abroad. UK delivery £3.99.
Bouquets and plants, gifts and hampers. Wine and more expensive bouquets delivered by courier: 'value' flowers and gifts by post. All deliveries free.
Flowers (some Fairtrade) plants and gifts, available for next day courier delivery or post (you choose). Standard UK delivery £3.95
Only a small selection of bouquets, grown and delivered by post direct from the nursery. Also sell plants, bulbs, herbs etc. Free delivery.
Bouquets, vase arrangements, indoor and outdoor plants, wine and gifts. Prices include next day (order by 5pm) and nominated day delivery.
Bouquets, indoor and outdoor plant arrangements, wine and champagne. Delivered on the day of your choice. UK delivery usually £3.95
Fresh Flowers Direct from the British Grower. Free delivery in the UK on all orders.
Works like a flower delivery service, but instead of flowers or plans you can send trees from around £3 to around £400 
Bouquets from £9.95. Deliver by post direct from farms in England or via a network of florists. Free UK post or charge for hand delivery.
Ten long-stemmed orchids
£17.99 post free
Ten mixed roses
£20.99
including delivery
For example, eFlorist give an extra 10% off when you use the code BUY10. Check the Discount Codes page for more.
This page is mainly about flowers and floral gifts for all occasions. Some of the companies also sell other small gifts and things related to plants, such as tools, seeds and even therapeutic products to soothe you after a day in the garden.
When you order flowers for delivery to someone who lives in a different town, there are two main ways the order can be handled. One way is known in the trade as 'relay'. Florists that use this system include Interflora and eFlorist (previously known as Teleflorist). What happens is that you place your order online or with one florist and they send your request to a florist, in area closer to the delivery address. The second florist makes up the bouquet and delivers it.
An advantage with this system is that the flowers are delivered by a local florist who be may be known to the person receiving the bouquet. You can also specify the delivery day. People who do not favour this system might say that there are also disadvantages. They might say that as two florists are involved, there are two lots of costs and two lots of profits, so you might not get such a good arrangement for the amount you pay. They might also argue that it is a disadvantage for you not to have any say in choosing the florist who is preparing and delivering the flowers. The florists involved in this way of working are usually local shops, who probably buy their flowers from wholesalers, who in turn get them from the growers or from auction, so they may have been handled a few times and may be a bit less fresh than the ones that come direct from the grower.
The alternative system involves one company either growing the flowers, or buying them from a grower (direct or through an auction) and sending them out. Examples of companies who do it this way are Blooming Direct, who grow a lot of their own flowers themselves, and Arena flowers who buy flowers at an auction in Holland.
The main advantage with this arrangement is that the company you deal with themselves grow or buy the flowers, prepare them and send them to the person you want to receive them. So there are fewer 'middle men' involved. This should mean that the flowers are fresher. It should also make them better value, because fewer people have to be paid along the way. On the other hand, unless the person receiving the flowers lives close to one of these sorts of florists, they will probably be delivered in a box, possibly by the postman, which isn't quite the same as being handed a bouquet by a specialist, and if they are coming by post you can't be certain they will arrive on the right day.
If you can't decide on the system you prefer, you could visit the Valueflora web site. They offer both systems. They send flowers from their own farms in England, the Isles of Scilly and the Channel Islands and they will also make relay arrangements with local florists not only in the UK but in 120 other countries.
At the end of the day, what matters most is that the flowers give great pleasure, that they are received in good condition and that they last well. Click on a few of the links in the boxes on the right and choose yours!
As an alternative, Trees2MyDoor send fruit trees, ornamental trees and other trees in place of flowers and plants for that longer lasting gift.