a few thoughts:
visit this this website:
http://www.tfl.gov.uk/see the links for: Oyster card for visitors (prepaid discounted travel on underground/Docklands light railway etc), Emirates Cable Car (another way to see some of London from above), and, right at the bottom of the page, Getting around London - RIVER. i say this because you can hop on & off the river ferries at will, and there are interesting photo opps to be had from there (Tower Bridge from beneath etc). subject to time you have available, you could visit Greenwich Village (via the river or u/ground) and the Maritime museum, the newly restored Cutty Sark,
http://www.rmg.co.uk/cuttysark/" rel="nofollow" target="_blank">
http://www.rmg.co.uk/cuttysark/.
You could also consider an upriver trip to
http://www.hrp.org.uk/HamptonCourtPalace/ If the weather is really miserable, museums may be the way to go: the British Museum is great (free!) for all sorts of interests, ancient Eygpt (real mummies), Roman pottery & artifacts, and of course, the Elgin Marbles (as stolen from Greece....)
whoa! forgot: Kew Gardens (best by train). Botanical specimens from around the world..
http://www.kew.org/please don't worry about crime in London: yes, hanging around some areas at night with a smart camera can be risky, wear a zippered jacket & wear the camera inside.
this sounds dreadful i know, but beware of scruffy, smelly people (mostly from eastern europe*) trying to engage you or distract you - if you travel alone, you will be approached (i speak from experience...) ignore them & move away. If you have someone with you, then they can watchout while you take pics.
(*There are far more decent people in Europe, East or otherwise, who are perfectly decent citizens and good folks: i know because i've met them! i've also met the 'bad' sort i described above all over Europe too - just they leave me alone as i'm usually in motorcyle clothing..)
hope you have a great time & get some great shots
:thumbup:
addendum: just found this ANSEL ADAMS @ the Maritime Museum!
http://www.rmg.co.uk/visit/events/ansel-adams" rel="nofollow" target="_blank">
http://www.rmg.co.uk/visit/events/ansel-adamsbest get up there myself ;)