Is there a way to set the disassembly flavour like there is in GDB within LLDB so that it spits out Intel style assembly rather than AT&T style?
set disa
No, not yet. Intel format disassembly is a feature I'm sure will be implemented eventually, but I don't think anyone is working on it today.
UPDATE: the ability to select the assembly style was added to the top of tree sources (v. http://lldb.llvm.org ) March 1st, 2013 with the -F or --flavor option to disassemble or the target.x86-disassembly-flavor setting in your ~/.lldbinit file. This will be available in future releases of lldb in Xcode.