I live in Carlisle, regular trail centre evening rides are Whinlatter, Mabie and Newcastleton, all about 45 mins or so away (traffic depending)
There is some cheeky stuff in woods but not what you’d call proper ride material just short tracks for messing about on.
Easy enough to go to keswick and ride, borrowdale bash (or half bash if you want shorter loop), lonscale fell and other cheeky options