Vodafone are a great brand, but I like the Innocent suggestion - a product which costs nothing to make and through the clever branding of a tidy concept they have massively increased the value of their product in the consumer's eye (both male and female).
GU desserts are pretty cool, massively overpriced but the branding works.
I really like Iceland with their Kerry Katona adverts - would I take her advice on raising a family? Great message! Morrisons have delivered a far more convincing brand over the last year.
Roomzzz is also a good but fairly small brand.
The problem with British brands is most of the good ones are no longer British. Companies like M&S are delivering lots of impactful messages in the little pool that is Britain but very few of our home made companies are innovating like American technological companies or German and Japanese car manufacturers.
This makes it nigh on impossible to impact on a global level.