I've been using D. A. L. E accounting services for the past twelve years to assess and file my self assessment tax return. They provide a fantastic service. Emails and questions are always responded to immediately.
I have often submitted my accounts very close to the deadline and they have always managed to process them before the deadline.
I cannot recommend them enough and will use their services for as long as they will have me as a customer.

John Cox - freelance lighting engineer and rigger