Much closer to Kibworth (a small town in rural Leicestershire north of Market Harborough - Kibworth's main claim to fame is Dave Crouch and Crouch Recovery, a huge family owned heavy vehicle towing and rescue company with huge bright orange tow trucks/wreckers) is Kelmarsh Hall and Gardens.
From their description of the Gardens:
"The Gardens at Kelmarsh Hall are designated by English Heritage (Historic England) as Grade II*, a garden of national significance.
The gardens surrounding the Hall are known for their relaxed charm and ‘haphazard luxuriance’.
The Gardens are open to for visitors to enjoy during our seasonal opening from April – October 2025.
All areas of the Historic gardens are open for exploring, including our wonderful Walled Garden, Long and Double Borders, Sunken Garden,
Philadelphus Garden and Fan Rose Garden.
We also open up our Lakeside, Wilderness and Woodland Walks when available.
In the Woodland, our Fairy Walk can also be found!"
https://kelmarsh.com/the-gardens/
Less than a 20 minute drive from Kibworth going through the nice canalside market town of Market Harborough to Kelmarsh.
Very tasty cakes and meals, very nice gardens, particularly helpful staff with disabled visitors. Pretty nice roses too.