If possible, check-out the Burkes on-line version at http://www.burkes-peerage.net. We appear on Burkes' site as "Marriott-Dodington Formerly of Horsington": searching for family "Dodington" doesn't work: you need to search for "Marriott-Dodington". Much of their info seems to stop in 1970, so please send them more up-to-date information: they welcome email updates.
Burkes also has records for the family KENNARD (ancestors of my part of Marriott-Dodington tree), as well as Cubitt (related to Kennards).