If you want to see England in full Autumn colour visit the Lake District in October.
The Lakes also has several interesting gardens to visit:

• Japanese Garden Giggle Alley
• Brockhole is an ornamental terraced garden nestled at the foot of the Langdale Pikes. A wildflower meadow and woodland belie the carefully planted schemes of roses, borders, shrubbery, and rock plants. Good planning means there is always something in bloom.
• Levens Hall a top topiary garden.
• Dalemain is a fascinating 5-acre Plantsman’s garden set against the picturesque splendour of the Lakeland Fells. Walk around the richly planted herbaceous borders with blue Himalayan poppies, nearly 200 old-fashioned roses, magnificent Abies Cephalonica, a Tudor Knot Garden and a wild garden with a profusion of flowering shrubs and wild flowers.
• Holker Hall glorious gardens, parkland and woodlands at Cartmel