UK Based Accountants Letter on Headed Paper For VISA Application

I need a letter on headed paper from a UK based, UK certified accountant confirming the source and amount of my self-employed income for a VISA application to migrate to Portugal.

It is a simple business with only two payments from clients per month and two expenses per month. I can provide bank statements for you to check the income and source and have also created a spreadsheet that documents income and expenses.

I have also drafted the letter, it’s only one page. I need this done quickly since my VISA appointment is in one week. Please apply with an example of your headed letter and a link to your business website.