Largest oak on the reserve.
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I see the buds are just starting to swell in your photo. Oak is firmly closed in Derbyshire, where as the ash has been open for a good few weeks - looks like another wet summer again then!!
Neither are actually in leaf round here, but I suspect the ash will be first - it's well in flower.
Lat/Lng: 52.624197222222, -0.51905555555556
OS grid ref: TF003039