Its been a while since I have used SCCM 2007 so bear with me but are you configuring the PKG to download locally or to run from Distribution Point?
[13-10-2014 16:09:34] [Installation] Executing [\\.....\SMSPKGE$\UK100124\DeploymentToolkit\Files\AnyConnectInstallationScript.cmd ]...
[13-10-2014 16:09:34] [Installation] Standard error output from the process []: '\\....\SMSPKGE$\UK100124\DeploymentToolkit\Files'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported. Defaulting to Windows directory.
'findstr' is not recognized as an internal or external command,
Reason I ask is, you can see that CMD.EXE starts in the UNC location above but shortly after it informs you that UNC paths are not supported it defaults to Windows directory and that is when it craps out. Perhaps you can modify the PKG to download content locally to the workstation and then run.