Hey Kat, great to hear from you!
> When a second authority responds to an information request via the request's email address… does such a response always automatically get stuck in the holding pen? I've been manually checking them as they've come in and they've all used the correct address for each request.
This shouldn't happen in "normal" operation – the response should go through to the request. Each request will have values for "Allow new responses from" and "Handle rejected responses".
"Allow new responses from" can be "anybody", "authority_only" or "nobody".
"Handle rejected responses" can be "bounce", "holding pen" or "blackhole".
By default requests are set to "anybody" / "holding_pen".
The situation you're describing makes me think that the requests might be "authority_only" / "holding_pen". This would mean that only emails sent from the domain matching the authority's request_email address domain would get through to the request; other senders' mail would get sent to the holding pen.
When you see more of these, I'd check those two values on the related request.
> Is there a trick to importing ics calendars for public holidays? …it fails returning the following not very illuminating error message: "Sorry, there was a problem processing this page
Have a lovely Christmas! 🎄
Best,
Gareth