Sheffield Park Gardens
Although relatively 'modern' in feel and design, these now National Trust owned gardens are mentioned in the Domesday Book when part of Sheffield Park estate. A previous owner, the 3rd Duke of Norfolk, Thomas Howard, invited Henry VIII over for a few 'meads' in August 1538.
Now detached from Sheffield Park House (private), Capability Brown landscaped the gardens in the 18th century, with additions by Arthur Gilstrap Soames later on. There is also a arboretum. With its ponds and resident fowl, a leisurely wander will give many ideas for your own formal gardens.