Actually, the feed currently does not validate: it specifies a TZID for an UTC time, which is forbidden as per section 3.2.19 of RFC5545. Both the validator you link to and my more restrictive one at http://arnout.engelen.eu/icalendar-validator point that out.
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Great! Thanks. I must have been sleepy when I last looked into it.
Parent comment
Actually, the feed currently does not validate: it specifies a TZID for an UTC time, which is forbidden as per section 3.2.19 of RFC5545. Both the validator you link to and my more restrictive one at http://arnout.engelen.eu/icalendar-validator point that out.