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Garbles
There is http://gravelmap.com/ but there aren't that many routes in the database. The biggest routes on it near London are http://gravelmap.com/route/848-forest and the two which connect to it, making a total of 9 miles. Also I haven't cycled either of those so can't say what they are like but the fact that there isn't a Google StreetView suggests it probably is indeed gravel...