I just finished watching The Invasion. Good serial, if perhaps a tad too long, and though they aren't in it much the Cybermen are ace. Vaughn is a great villain, as if poor put upon Packer. It's fun to see UNIT in action and there are a couple of nice fire fights between soliders and Cybermen which are well handled, in fact some of the space effects look very good as well, all things considered, and obviously the production got a bit of a helping hand fro, the MOD. Have to say the use of stock footage was quite well utilised, it can look very jarring but here I thought it looked fairly seemless...maybe the B&W helped?
I love the bit where it looks like all the radar operators are checking out Zoe's bum as she rushes past them with her clipboard