This is believed to be due to high demand for the books after Virgin lost their licence to publish original Doctor Who fiction.
Although some incidental music tracks do appear, most of the album's content is by original Doctor Who sound effects creator Brian Hodgson.
The Ice Warriors were a well-known villain of the original Doctor Who series.
O'Mahony's first professionally published work were original Doctor Who novels in the 1990s.
Big Finish's licence, which has been extended to 31 December 2015, only covers the original Doctor Who series.
This was the only original Doctor Who episode from the original era to top the UK charts.
He has also written numerous short stories, and original Doctor Who audiobooks.
Personally, I loved the original Doctor Who series.
She was the original Doctor Who companion and left the Doctor to remain on Earth.