The wall's coming along nicely, but at some point it's going to have to meet
up with an existing wall built of blocks on edge.
So, a couple of questions...

What's the best way to 'tie' the new wall to the existing one?
I would like to finish it all of with the same coping stones, but as the new
wall is built of blocks on their face, it is twice as thick as the old one.
Any ideas how to fit the wide coping on top of the narrow wall? Without
knocking it all down and starting again, that is. Can the wall be made wider
at the top somehow? It won't be visible from behind.

Regards,

Neil