Thanks! 

We dont really change the environment long term, as the test spawns a process which has its process modified and runs to completion ie any changes are thrown away. However, I do agree that if there was an important environment variable which controlled the shell (in the bug's case it was BASH_xxx, but could be anything) then it would be wise to leave it in place, so such a change probably isnt a bad idea anyway.  (I'll make this change in try 2, as I need to fix the broken NT4 stuff from patch 1 anyway)

Jason