Company car tax is it worth dropping the car?

There are calculators out there but maybe I can point you in the right direction. Over the years I have very rarely found giving up the company car to be beneficial despite the ever increasing tax on such a benefit. In some cases, especially where there is low business mileage, it will be beneficial to give up the free fuel which I think is happening in your case.

Let's say you have a company car with a cost price of £15000 and cO2 emissions of 145. The benefit is calculated as follows:

£15000 x 20% (the appropriate percentage for 145 cO2 emissions) =

£3000

The tax on this is £600 per annum if you are basic rate, £1200 if higher rate. From your post you will be somewhere in between the two.
The company pays all running costs, finances the car and takes the depreciation hit.

You need to ask yourself if you the cost of

servicing
car tax
repairs
insurance

will be less than this. On top of this you have to finance the car and (the big one) take the hit on the depreciation when you go to sell it.

Even if your husband is a higher rate taxpayer it is likely that the company car is still very much to his benefit.

On the mileage front, the company will still be able to pay you between 10 and 17p per mile if you have a company car (depends on the cc and fuel used)

I hope that this is helpful to you.