Hi, Glyn.
I've been playing around with org-beamer for a little while and have gotten
something like what you seem to want to work. I've revised your example in
the way that I've been doing it.
* The furniture.
:B_frame
:PROPERTIES:
:BEAMER_env: block
:BEAMER_envargs: [+-]
:END:
Some
Good Morning :-)
I'm having trouble getting beamer overlays to work properly when
producing slides via org-mode. This may well be due to my not
understanding the documentation!!
I can only get this to work by dropping down into LaTeX - which on this
scale is pretty painless - but feel sure