I'm not familiar with Flemish or Stretcher bonds? What are these?

Stetcher bond is just bricks laid end to end, alternating by half a brick's
width every course. Most modern houses are built like this as it is the
cheapest and quickest way to build a single leaf wall. Modern houses have
cavities, so the outer wall is only one brick wide.

Older houses had solid walls, with usually double brick thickness. For this,
you need some of the bricks to be laid across the thickness of the wall to
bond the wall together. The most common way to do this is the Flemish bond,
where you lay bricks alternately across and along the wall. You will likely
see such bonding on most Victorian buildings. However, the Victorians did
like to break down the monotony by varying the bond. Perhaps missing out
occasional cross bonding bricks. This is why even a plain Victorian wall
looks less austere than a modern stretcher bonding.

Christian.