Last Orders - One of the best online off-licenses around! They stock an amazing variety of alcohol and have a pretty extensive section on champagnes too. Famous names such as Bollinger and Brasault are available at reasonable prices or you can really splash out with a specially boxed bottle of Dom Perignon 1998. They've  got a champagne for every occasion and offer an excellent next-day delivery service. A good place to start when searching for congratulations gifts.

Eden4flowers - This online florist offers a good section on congratulations gifts that includes balloons cakes and flowers. They provide fresh flowers and good prices in the form of baskets, bouquets and hand-picked bunches. They also have an excellent collection of over 500 different gifts and accessories to compliment your floral gift, including soft toys, chocolates, hampers and balloons.