I did something very similar while trying to find Stradishall in Suffolk as a solo nav TP (it's disused, turned into one of HM Prisons, and you can' see much of the characteristic airfield shape any more). The nice man at Wattisham, whose MATZ I had recently crossed, didn't have it marked on his radar but was most happy to look it up on the road map (he said!) and give me a course to steer. I'm sure from the controller's point of view it's preferable to lend a hand than have someone who's lost blundering around unpredictably near your airspace.