Coton Manor, Northamptonshire
www.cotonmanor.co.uk for opening times and prices
Chenies Manor House, Buckinghamshire
http://www.cheniesmanorhouse.co.uk
Waterperry Gardens, Oxfordshire
http://www.waterperrygardens.co.uk
a little further afield but well worth a visit:
Royal Botanic Gardens, Kew http://www.kew.org/
The Savill Garden, Windsor www.theroyallandscape.co.uk
RHS Garden Wisley www.rhs.org.uk/WhatsOn/Gardens/wisley/