domain keys

[Terry]

Hi I have setup exim to sign my emails as per documentation here 
http://wiki.exim.org/DomainKeys

The mails are getting domainkeys=pass (ok); from=bluelight.org.uk; from 
yahoo
so that bit is ok.
But I am failing the policy test here 
http://domainkeys.sourceforge.net/policycheck.html

I have this in my zone file. Any advice or pointers welcome

_domainkey.bluelight.org.uk. IN TXT "k=rsa; t=y; o=-;"
myselector._domainkey.bluelight.org.uk.  IN      TXT     "k=rsa; t=y; 
p=MHwwDQYJKoZIhvcNAQEBBQADawAw

Thanks
Terry