Self assessment/recording van purchase/accruals basis accounting

Hi, I purchased a van for £15k in Aug 2023 as a sole trader NOT using simplified expenses while waiting for decision on a grant application we had made to our local council due to the introduction of a Clean Air Zone. We received the grant £4k (approx) - how do I account for it and over how many years is it an asset? Please don't send me a heap of links I can't understand. I just want to know I am recording this correctly in the accounts. Sole Trader so have no accountant. Thank you

Hi Gill Drinkald,
This forum is for guidance only and it will be links that we would send.
To have this asnwered specifically to your requirements, please telephone 0300 200 3310.
Thank you.