The domain expired on 3rd April but they are working on it.
I got this reply to my query
"Unfortunately, our webprovider did not renew our domain name,
as required by agreement. The original company I dealt with, has been on-sold many times, and I suppose noone in this company has a knowledge of their agreed obligations. Our site was on automatic renewal, but the new owners apparently didn't bother about that.
On Saturday, 4th April, someone successfully redirected all incoming traffic to their own site.
We have set up again on a brand new site."
The new domain is being setup at the moment and should be available in a couple of days at http://alanwright-ballroomdancing.co.nz/
(Jonathan, I don't know if I broke the rules in posting that address. If so, I am sorry, please delete it)