I have followed this way of doing my mileage.
I have created the supplier account.
Next I paid it from the Proprietor Drawings account as cash (was this correct?).
I don’t see the amount showing on my profit and loss as any sort of expenses
I don’t understand the next part how to reimburse.
Any help gratefully appreciated
For Sole Traders, the mileage expense invoice would normally be paid from the Proprietor Drawings Account. Unlike limited companies, sole trader activity is all under the one legal entity (which is you), the Proprietor Drawings account offers a way to separate those items that are personal from the business transactions. When the mileage expense invoice is paid from this account it serves as a way to show that those funds are owed to the sole trader from the business. When you are ready to reimburse just tag the outgoing from the business account as a transfer to the Proprietor Drawings Account thus netting off the original payment.