Sorry about above..
1. estimate number of business miles and multiply by mileage rate paid
compare with
2. calculate bik ... this is based on 30% of original market value.. but can be reduced by amount of mileage
In a large mileage situation, and when insurance costs are not high then charging the company for mileage is generally a better option.
In your case mileage is low and you should get an accountant to do some calculations for you. Or possibly the new employer has a company accountant who can calculate this for you.