With my job, I do approximately 25,000 miles a year for my job, and usually I fill in a P87 form. I usually always send it away as soon as the tax year ends, but the taxman always takes months and i mean months to acknowledge my form before issuing a rebate.
My work give me 28p a mile, so I know using a P87 form, I should be able to claim up to 40p a mile for the first 10,000 miles and then 25p for any other miles after this.
The P87 form also says I should fill in a tax return instead if my expenses exceed £2,500.
Its plain obvious to see that now, but do i really need to fill in a tax return? My salary is only £13.5k.