When in London...
...do as London and UK restaurant guide Harden's tells you.
Not only they have provide reviews of restaurants, but they also are based in London, therefore the information is probably fresher than other guides.
On their site, you can search restaurants by cuisines or by features - so now you have no excuse for claiming that all British food is bland.
While researching your next trip to London, check out their top 10 London restaurants. You might be surprised to find out that French cuisine is making a come back, as chef Morgan Meunier can probably testify.
On the same note, here's a way to save for that fancy dinner in London: travel to London during the European low-season (January - March): Air + 5 nts = $539