It is my belief though that the combined output of Cumbrian breweries, leaving out Jennings, is big enough to worry even Marstons. I thought I might have a guesstimate of the total brewing capacity of Cumbria, just to illustrate the point. The figures here would no doubt fail the detailed scrutiny of Ron, but I'm not as patient with detail as he clearly is. His tables are more colourful as well. The figures are based on quick research from the GBG, Internet and my own knowledge. I believe it to be a fair estimate, but would need more time to be accurate.
It is also worth noting that this is an estimate of maximum capacity per week, not achieved output. My output for instance, as an average over the year, is about a quarter of maximum.
Jennings at Cockermouth have a brew length of around 160 barrels. The total brew capacity of all the other Cumbrian breweries are significant compared to the Marstons breweries.
It's nice to be a small brewer in Cumbria. There is a level of cooperation between some of the breweries that is nice. I'd like to see a greater level of cooperation but it would seem that coordinating such cooperation is akin to herding cats. I believe individual breweries may not be a threat but combined and coordinated the total is greater than the sum of the parts.
If any brewery would like to confirm their true capacity then I am only too happy to update here. I understand that such information might be considered commercially sensitive, but perhaps this sort of information might help dispel the "Cupboard Brewing" myth.