Enjoyed the episode. JLC is adorable and I'm happy to have her aboard the TARDIS. Not overly thrilled that there needs to be some BIG MYSTERY surrounding who she is though. Can't the Doctor just pick up a regular clever girl? Hopefully the payoff will be worth the ride.
The motorbike up the building was goofy, and the "doctor who?" gag was cute initially, but went on too long and, over all, is getting stale quick.
As someone else mentioned earlier, I too got a Judi Dench vibe from the evil wi-fi woman.