The UK's Fantasy Publishing Powerhouses

The UK's fantasy publishing industry is home to a number of powerful and well-established publishers that have played a significant role in shaping the genre. Some of the most notable fantasy publishing powerhouses in the UK include:

1. HarperCollins: HarperCollins is one of the largest and most well-known publishers in the UK, and has a strong fantasy imprint called Voyager. They have published many bestselling fantasy series, including George R.R. Martin's A Song of Ice and Fire series, and Brandon Sanderson's Mistborn series.

2. Hachette: Hachette is another large traditional publisher in the UK and has a fantasy imprint called Gollancz. They have published many bestselling fantasy series, including Joe Abercrombie's First Law series, and Robert Jordan's The Wheel of Time series.

3. Penguin Random House: Penguin Random House is one of the largest publishers in the UK and has a fantasy imprint called Del Rey. They have published many bestselling fantasy series, including J.K. Rowling's Harry Potter series, and Philip Pullman's His Dark Materials series.

4. Orion Publishing Group: Orion is a large independent publisher in the UK, and has a fantasy imprint called Gollancz. They have published many bestselling fantasy series, including China Miéville's Bas-Lag series, and Joe Abercrombie's First Law series.

5. Jo Fletcher Books: Jo Fletcher Books is a small independent publisher in the UK, that specializes in fantasy literature. They have published many bestselling fantasy series, including Trudi Canavan's Black Magician series, and Mark Lawrence's The Broken Empire series.

6. Angry Robot Books: Angry Robot Books is a small independent publisher in the UK, that specializes in fantasy literature. They have published many bestselling fantasy series, including Adam Christopher's Empire State series, and Fran Wilde's The Bone Universe series.

7. Head of Zeus: Head of Zeus is an independent publisher in the UK, that specializes in fantasy literature. They have published many bestselling fantasy series, including Ben Aaronovitch's Rivers of London series, and Mark Lawrence's The Broken Empire series.

8. Tor UK: Tor UK is an imprint of Pan Macmillan, it specializes in science fiction, fantasy and horror. They have published many bestselling fantasy series, including China Miéville's Bas-Lag series, and Joe Abercrombie's First Law series.

These are just a few examples of the many fantasy publishing powerhouses in the UK. Each of these publishers have played a significant role in shaping the fantasy genre and have a reputation for publishing high-quality fantasy literature.