You may find this useful Mike
The Vitality Pro @joss mentioned but not on the list, has a 10day battery life and takes 22hrs to charge, Compared with the more basic Vitality plus that has a 8 day battery life and 16hr charge time.
The Oral B Pro 3 has a liyhium battery with 14+ day usage and takes 12hrs to charge, compared to the Oral be Pro 2 has a lithium battery with 14+day use and takes 15hrs to charge. Both the Pro 2 and 3 are available at the same price of about £40.
Electric teeth have some good revies of each model