cron as normal user - changed

[William John Murray]

 Hello there,
               I see that a cron.allow/cron.deny combination
is now specifically required, but I am not sure how to make
it work correctly.
   If I have a user 'myuser' who issues 

crontab afile

  the response is

You (myuser) are not allowed to use this program (crontab)
See crontab(1) for more information.

   Now I 'touch /etc/crontab.deny'; and get:

cron/tmp.XXXXTBxTOG: Permission denied.

I am not sure where this file is not being written - perhaps
the protection on this need changing? Any ideas anyone?
     Bill