tax return question helpy me please

[supermarketworker]

been on hold for zzz years to the IR - i work from home online business and do soem mileage associated with my business - going to the post office mainly - how much per mile can you put down on your tax return - not claiming the insurance or anything just the mileage - me thinks its 40p - is it or has it gone up? Also i have listed these expenses to divvy up accordingy
Gas
Electricity
Water
Council Tax
House Insurance
Mortgage Interest
Broadband/ House Phone
Mobile Phone
Car mileage

I am going to add up the rooms in the house (i exclude kitchen and utility and toilet right?) and divide by no of rooms i use so 1. Am i right? so eg .500 on elec/ 6??? or do i include the kitchen?

thankyou knowledgeable persons

Car mileage is 40p per mile for the first 10,000 miles for journeys made up to 5th April 2011 (45p from 6th April).

There is no right or wrong way to apportion household expenses, except that you must also apportion use by time. This is very important because if any part of your house is never used for a non-business purpose you may be liable for Capital Gains Tax on that part.

More details on the HMRC site, including examples. Unless they are part of your business (eg catering), it is normal to exclude kitchens, bathrooms etc. because their use is incidental to the use of the dwelling both as a home and as a business (you make tea, use the toilet etc. while you are working as well as when you are not).