good question - i have had a little look - beinga litle look there is a chance i may have missed something.
Ok i have simply lifted this from the att website so you should be fine claiming for business use element at least without any issues - presuming you use a fair calculation method.
The lack of AFRs for Pure-electric company cars makes the situation for reimbursing employees for business mileage more complicated. Where an employee charges a Pure-electric company car:
If their employer reimburses them for the cost of the electricity, the tax treatment depends on the use of the car:
Business use only – the s289A ITEPA 2003 exemption for paid or reimbursed expenses will exempt the amount received.
Personal or mixed use - the reimbursement is taxable as earnings, with the employee entitled to a deduction for the cost of business miles travelled.
If their employer does not reimburse them, they are entitled to a deduction under s337/s338 ITEPA 2003 for the actual electricity cost of business miles travelled.
Note unless you have very high personal mileage or very low business mileage you may be better off ditching the fuel benefit and then simply reimbursing yourself at the official rate of 10p-12p per business mile travelled - or paying the company back for personal fuel (not sure how you would calculate that with a hybrid!). The higher the electric use of the car the more you are likely to save in this method as the cost of electric charging will be less than 10p per mile.
Unless you change car the swap would need to be done from the start of the tax year - i can't think of anything stopping you reimbursing company now for private use from April onwards if that is a better route.