Filming on Block 4 officially started today, but here's several more clips from the recent filming at Pont Melin Fach for episode 3, Robots of Sherwood.
First, the Doctor hanging out with the Merry Men:
Second, removing an arrow from the TARDIS (That seems to happen a lot)
Third, The Doctor speaks to Robin Hood across a river
Robin Hood (attempts to) fire an arrow skyward (this appears to be from the end of the episode.)
And Clara learns how to fire a bow
And Mike Winks, who braved the sloggy welsh weather to take all these video, has semi-confirmed my suspicion that the Robots of Robots of Sherwood do include Robin, and possibly the rest of his merry men, at least based on some of Peter's dialog following the log battle.