I walked from the train station to the Museum of Computing, which provided enough of a walk through the Bletchley facility (and noticing enough "Asbestos Warning" signs) to fill my need for that portion of the site.
If nothing else, being able to say "Milton Keynes is on my tourist bucket list" is an amusing thing to say to UK co-workers.
I think it's testing how fast you can go from ~25 (depends on how quickly you dare take a roundabout) to 70 in between each roundabout that is the best part of living next to MK.
I visited family in Swindon, so they decide "we must see their Nested Fractal Roundabout of Doom" because that's obviously their primary tourist attraction now.
If nothing else, being able to say "Milton Keynes is on my tourist bucket list" is an amusing thing to say to UK co-workers.