Oh you so need more then one day in London! Honestly you would be so rushed if you did that tour and would leave you really wanting more. I would save the tour of Europe for another time when you have more time to do it.:
I got one for a tour of Europe (12 days) plus day in London
Or alternatively if you really do want to do Europe only pick 1-2 countries to do in that timeframe...you could do UK/Ireland in 2 weeks but you lose a day there and back in travel time, or even do Italy for 2 weeks - now that would be divine.:D
