London visit

This Tuesday I will be attempting my first major assault on the capital (albeit a mere 3 and a half hours) This is more of a snapping expedition rather than a pub crawl and was wondering if there was any must see pubs as I will certainly be having a few along my way
The area will either be around Kings Cross and walking down in the direction of Russell Square or more likely to the other side of Euston station and to the left of Tottenham Court Road.
I have found in the major cities when snapping pubs that up 20% of time is taken up waiting to cross roads and the reason why I have not quite finalised the route.

Your help would be much appreciated