Walnut?

Walnut?

Observation - Walnut? - UK and Ireland. Description: Found in hedgerow looked different from J. regia. Both J. regia and J nigra are common in the area. Could it be a hybrid? or is this in the range of leaf shape of J regia. I could not find a decent picture of hybrid only fuzzy (when magnified) in http

Found in hedgerow looked different from J. regia. Both J. regia and J nigra are common in the area. Could it be a hybrid? or is this in the range of leaf shape of J regia. I could not find a decent picture of hybrid only fuzzy (when magnified) in

http://www.sylva.org.uk/forestryhorizons/documents/QJF_Jan2010_walnuthybrids.pdf

Help please