I saw London Has Fallen yesterday... and loved every minute of it.
I thought it was better than the first film (Olympus Has Fallen), with a better story line and a semi-believable plot. The role of the hero was made for Gerrard Butler, though I don't know what Lance Armstrong (Aaron Eckhart) was doing as the POTUS
Some of the effects were a bit ropey, but then you can't actually go round blowing historic London monuments up for a film, can you.
I also suspect the SAS would NEVER get themselves into a fire-fight in a narrow street, but let's gloss over that.
I'd give it a 8/10 and will definitely watch it when it pops up on Prime, or Netflix
Like someone above said, the trailer for Eye In The Sky (Helen Mirren / the late Alan Rickman) looked right up my alley too !