If there's one thing London loves it's pubs - it has thousands of them - and a lot of them have been around for way longer than you or I. Take my option for today - the Blue Anchor - it has proudly been plying its trade, serving the thirsty of Hammersmith, since 1722.
Actually, my top statement may be a little inaccurate, you see, if you check their history you will see that under the name 'The Blew Anchor', it may have been around a little longer...
Anyway, back to the present - this pub is cute as a button, has plenty of out-front seating for a lovely day in front of the river, and a decent view of the equally pretty Hammersmith Bridge. But of course it's not all about the views, it's about what's behind the bar.
There's a great selection of, well, everything - beers, wines, food - it's all going on here. And the food list especially is jaw-dropping. There is everything from canapes to main meals. If I were you I would go for the set meal and settle in for the afternoon. Although obviously I would recommend outside on a nice day, actually the best view point is upstairs in 'The River Room' - though of course, a lot of other people will also think the same, so get there early.
I think I've stated the case for this pub pretty comprehensively, and once you see it, you won't need too much more convincing - therefore I think you should go and drop anchor there the next time you're in Hammersmith. Mine's a pint.