Page 404 Error on Currency Selection

[DrByte]

So, if we abandon the .net redirect, and set the configure files to point at ho-hose.co.uk/store, and we point the browser to the index.php file in the store subdirectory, would it be reasonable to expect the store to work

Yes, i think abandoning the .net redirect would be smart ... otherwise you don't really have a 'test' area ... you're sharing the same store on both domains, and causing yourself unnecessary grief.

ho-hose.net is not my primary domian. ho-hose.co.uk is supposed to be my primary domain for my current non-ZC domain. This domain's files live in the root folder on the host.
ho-hose.net is a domain that I use for my ZC stor testing purposes, and it lives in a subdirectory on the host server.

So, I think you're saying this:
a) .net = /public_html/store
and
b) .co.uk = /public_html/

Is that correct?

If so, then your /public_html/includes/configure.php needs to talk about the .co.uk domain
and the /public_html/store/includes/configure.php needs to talk about the .net domain