Was the appeal against the refusal of conditional release filed on time?
No. The ten-day appeal period had expired before the filing on 2015-01-19, even if prison forwarding delays were considered.
The decision was validly notified at the prison address; as a communication from an authority, no mail control applied. The letter is deemed to have reached the addressee shortly after collection on 2014-12-24, so the deadline expired in early January 2015.