London Shots

This is my first time in London and I have some great shots to share. It has been really overcast so some shots are flat but I make due where possible. One thing I wanted to ask; is there a filter I can use for overcast days to prevent clipping on the white end of the histogram (when I try to get a good exposure I usually have to stop down 2/3 to get the sky exposed without clipping)? Let me know what you think (I PP'd a little bit on all 3).

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Third.

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London is my favourite city so all buildings are easily recognisable. That is also the point.... nice - touristy - shots but nothing special. Try to find a different angle, an interesting detail. London is full of them but you'll not find them near the Big Ben. More like in Soho, Camden Lock, Isle of Dogs or Billingsgate.....

I cannot help you with the filters - don't use any myself - but the skies look OK to me.