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A burl (American English) or bur or burr (British English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds.
A burl results from a tree undergoing some form of stress. It may be caused by an injury, virus or fungus.
Hope this helps!
Although there are Hazel bushes growing around the tree, the one with the growth looks like an Alder species of some kind.
Lat/Lng: 52.6, 1.3
OS grid ref: TG2308