An afternoon with a driver & guide in London would be very expensive, and maybe not the way to go.
You can find London Guides here http://www.britainsbestguides.org/search-results/
If possible have your tour on a Sunday, less traffic.
For an afternoon you can take the BIG BUS tour. You can get on and off and get on th enext one all afternoon.
http://www.bigbustours.com/eng/london/custompage.aspx?id=london_sightsee...
Consider taking the boat on the River Thames starting at Houses of Parliament and going down to the Tower of London.
Better than a bus tour is to take actual buses (get an Oyster card to pay). Sit up top so you can see the upper stories of the buildings - always interesting.
See: https://oyster.tfl.gov.uk/oyster/entry.do
And: http://www.tfl.gov.uk/gettingaround/maps/buses/pdf/central-london-bus-ma...
What do you want to see? Note that if it rains you may be better off in a museum - the British Museum or the Victoria and Albert, both free.
driver/ guide
An afternoon with a driver & guide in London would be very expensive, and maybe not the way to go.
You can find London Guides here http://www.britainsbestguides.org/search-results/
If possible have your tour on a Sunday, less traffic.
For an afternoon you can take the BIG BUS tour. You can get on and off and get on th enext one all afternoon.
http://www.bigbustours.com/eng/london/custompage.aspx?id=london_sightsee...
Consider taking the boat on the River Thames starting at Houses of Parliament and going down to the Tower of London.
Buses
Better than a bus tour is to take actual buses (get an Oyster card to pay). Sit up top so you can see the upper stories of the buildings - always interesting.
See: https://oyster.tfl.gov.uk/oyster/entry.do
And: http://www.tfl.gov.uk/gettingaround/maps/buses/pdf/central-london-bus-ma...
What do you want to see? Note that if it rains you may be better off in a museum - the British Museum or the Victoria and Albert, both free.