Petrol and travel allowance claims

How do I claim petrol on tax? For the previous tax year I've kept a detailed petrol log through your app and I've been using my own petrol card and claiming back. I do receive a travel allowance. The company has now given us petrol cards, do I still need to keep a log to claim or can I not claim because the company is paying?

You should be able to claim the fuel costs you incurred before your employer gave you the petrol card, seeing as you still receive a travel allowance you can still claim for the KMs you drove for business expenses.