Mark wrote:
Hi, My conservatory project is finally making progress. Underfloor
heating is down (presurised, but not connected, until the screed is
fully dried). Windowsill boards are on.

I'm not sure how to neatly close off the end of the cavity (as you can
see I am using unfinished brick).

http://img149.imageshack.us/img149/2097/dsc01660mq1.jpg

Any suggestions?

Just mortar in pieces of brick, cut to size, into the gap; ideally with
a vertical strip of DPC within the cavity against the external leaf of
the wall (so you'd *just* see the edge of the DPC protruding much as you
can along the base of the wall).

David