Thanks 1nickt.

I tried cpanm -n Zilla::Dist but it bailed out after about 30 minutes because of failing dependencies.
At least I've now got another 175 modules installed .... none of which I'll ever use.

It's not a big deal. If it was straightforward enough I would have given the github distro a run.
It's apparently not, so I won't.

Cheers,
Rob