There is one sessile oak (Quercus petraea) in Savernake Forest in Marlborough (county of Wiltshire).
The girth was measured more than once:
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The tree is standing close the A 346, at the edge of the forest.
This tree is called "Big-Belly Oak". The girth of the tree is 10.25 m measured at a height of 1.50 m (2009, Owen Johnson). This tree was planted around the year 1002 ± 10, which makes it around 1011 ± 10 years old (Henk van Boeschoten, Oct 1, 2011).The girth was measured more than once:
| Year | Girth@1.3 m | Girth@1.5 m | Measurement |
| 2009 | 11.18 m | 10.25 m | Owen Johnson |
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Big-Belly Oak (sessile oak "3713")
