To know your exact company car tax, you need to put in ALL the details like for older cars, Year of Registration, Month of Registration, Make, If Ford focus, then which, then exact model, then engine type and its strength, its fuel type, etc. So its not possible to provide you with "Exact" figures much of the precise information is missing.
However, I can give your break up of your salary without the car, which will NOT VARY MUCH than what I had said.
Taking your salary as GBP 25,000, it works out as ::
Gross Income £25,000.00
Taxable Income £17,525.00 £1,460.42 £337.02 £67.40
National Insurance £2,133.00
Take Home £19,362.00
I hope this helps... You are not a pain. Its my pleasure to assist you as much as I can.