Stuart Broad had a couple of his magic spells during the first test but did he get his tactics wrong with the new ball in the second innings in hindsight? Was he trying too hard to york the lower order batsmen out when good lengths would have been more difficult. At this level, what sort of bowling troubles the lower order?

Great question. Happens a lot to bowlers where expectation and pressure make you overreach for a wickets. Truth is I reckon 8 times out of 10, wickets come from batters getting themselves out. Quality areas and consistent presume makes batters push at the ball or play over ambitious shots. Tailenders even more so. So the better tactic is plenty of quality in and around the usual area of off stump with occasional Yorker. Prevent scoring and of course they still know there is a great ball
Coming that might get them out (the 2 out of 10 ball creates the anxiety that brings the other 8) Make the tail think there are no runs and that they have to change something. This will bring the error. Example A was Broads dismissal of Boland 2nd innings to great length ball after a few (very few) short ones in amongst patient bowling. The fielders have a role here as well. They have to stay patient and not create an expectation that you need a wicket every ball. So, yes too many Yorkers is generally a tactical mistake in my view that comes about from the pressure of expectation. It brings errors from the bowler and allows the tailenders to grow in confidence.

Variety on the stumps. i.e Subtle changes of pace on off stump to a lower order batsman usually works. Make them play on the front foot and you will get a spooned catch with the slower ball, or LBW or bowled with the quicker off / leg cutter. Most lower order batsmen are waiting for the Yorker. Anderson should have been bowling more, as he is smarter and not a "one pace" bowler.

Hello Steven
Couldn't agree more with Gregs summation of the scenario.
The skill set of lower order batsmen these days is a little further advanced than in the past and is improving however there is no substitution for an express fast bowler putting the fear of god into the tail and re enforcing the fact that they are not welcome in the middle at the latter stages of an innings.
At this moment in time England do not possess an express fast bowler to blast the lower order out. As Greg mentions a good attacking line and length mixed up with the occasional yorker and short ball to test the batsman out supported by a field set to the batsman's skill level is the consistent approach.
There is nothing better than seeing a quality express fast bowler apply his trade and watching the lift that he gives his team mates

Easy “ Toes and Nose” for tailenders .
Go upstairs first , then castle them .
As told by ex batsman !

Some great comments there. One thing that is missing though is field settings for tailenders. I remember reading a detailed piece on captaincy by a long term first grade captain at Sydney Uni back in the 80s (can’t remember his name). His advice was never to over attack tailenders because they get themselves out. I put this into practice and it worked for me in 2nd grade level. Therefore, Greg Rowell’s bowling strategy to a semi attacking field. Not sure if this would work at the modern test level but Greg’s comments make me think yes.