Castle Rock Brewery was originally set up as a joint venture with Bramcote Brewery. Bramcote Brewery was wound up and a new company was set up, 50% owned by Tynemill and 50% owned by the previous owners of Bramcote Brewery, on a new site next to Tynemill’s pub, The Vat and Fiddle. The Vat and Fiddle became the ‘Brewery Tap’.

Following slow beginnings Castle Rock Brewery grew slowly but in 2001 Tynemill bought out the other shareholders and Castle Rock Brewery became a wholly owned subsidiary of Tynemill.
A new head brewer was recruited – Pete Wooding , and the brewery was expanded with new equipment and new brands. Production has grown over the years from 35 bls. per week in 2003 to 115/120 bls. per week in 2010.

Castle Rock Brewery has been brewing at capacity for over a year and the decision was made in 2009 to build a new brewery in adjoining property, giving Castle Rock Brewery a potential capacity of 300+ bls. per week.

Demand for Castle Rock Brewery beers has been growing rapidly due to the high quality introduced by the current head brewer Adrian Redgrove who joined in December 2004.

The Brewery has been so successful that Tynemill has changed its trading name to Castle Rock Brewery!

Tynemill (now Castle Rock) pubs have also been extremely successful, winning Pub Group of the Year accolade in 2002, 2006 and 2008.

Current regular brews (2007)

• Black Gold (Dark Mild
  Mild ale
  Mild ale is a low-gravity beer, or beer with a predominantly malty palate, that originated in Britain in the 17th century or earlier. Modern mild ales are mainly dark coloured with an abv of 3% to 3.6%, though there are lighter hued examples, as well as stronger examples reaching 6% abv and...
  
  ), 3.5%
• Nottingham Gold (Pale ale
  Pale ale
  Pale ale is a beer which uses a warm fermentation and predominantly pale malt. It is one of the world's major beer styles.The higher proportion of pale malts results in a lighter colour. The term "pale ale" was being applied around 1703 for beers made from malts dried with coke, which resulted in a...
  
  ), 3.5%
• Harvest Pale (Pale ale
  Pale ale
  Pale ale is a beer which uses a warm fermentation and predominantly pale malt. It is one of the world's major beer styles.The higher proportion of pale malts results in a lighter colour. The term "pale ale" was being applied around 1703 for beers made from malts dried with coke, which resulted in a...
  
  ), 3.8%
• Hemlock Bitter (Bitter
  Bitter (beer)
  Bitter is an English term for pale ale. Bitters vary in colour from gold to dark amber and in strength from 3% to 7% alcohol by volume.-Brief history:...
  
  ), 4.0%
• Preservation Fine Ale (Bitter
  Bitter (beer)
  Bitter is an English term for pale ale. Bitters vary in colour from gold to dark amber and in strength from 3% to 7% alcohol by volume.-Brief history:...
  
  ), 4.4%
• Elsie Mo (Pale ale
  Pale ale
  Pale ale is a beer which uses a warm fermentation and predominantly pale malt. It is one of the world's major beer styles.The higher proportion of pale malts results in a lighter colour. The term "pale ale" was being applied around 1703 for beers made from malts dried with coke, which resulted in a...
  
  ), 4.7%

Castle Rock also brew a range of one-offs and seasonal beers and also a "Natural Selection" wildlife ales, in conjunction with the Wildlife Trusts.

It is acceptable to serve this brewery's beers through a Sparkler.