As an alternative to conventional dining I can personally recommend Berry Bros & Rudd, Wine merchants to Royalty, at the bottom end of St.James Street where it meets Pall Mall. I believe that I am correct in saying that they are the oldest wine and spirits suppliers in London, once being a coffee importer and temporary residence of one Napoleon of France. They offer themed tasting evenings of red and white wines accompanied with a signature menu to suit each of the selected samples and an explanation of the vineyard from which they have been sourced. They also host lunches with less sampling. Both these events take place in the revamped cellars. I know that these evenings can be extremely popular so I would recommend that you book well in advance of any proposed visit to London.