Of course, the fees charged will depend on the services you require.
But to give an example, if you are a sole trader requiring monthly and annual accounts, along with completion of a self-assessment Tax return, it will cost in the region of £400 per year, assuming that no book-keeping services are required.
If you simply require your Self-Assessment Tax Return completing, it could be as little as £100.
You can contact me for a no obligation and no pressure quote - please visit the contacts section of the website.