In his weekly The Bar Man column, Jeff Hoyle discusses the differences between keg beer and the cask-conditioned version… Sometimes when I wander off-topic to describe travels to obscure places or sporting events, it can be difficult to remember that I was invited to contribute to the Lynn News on behalf of the Campaign for Real Ale (CAMRA), so occasionally I had better focus on the topic. For those who don’t know, real ale leaves the brewery with yeast in it and continues to ferment in the container, usually a cask. This is delivered to the drinker without contact with gas such as carbon di…