ATT was founded in 1980 and provides recognized professional qualifications and memberships for accounting professionals in the UK. Buy an AAT Level 4 diploma. How long to get an AAT Level 4 diploma in UK? How much to order an AAT Level 4 diploma certificate in 2025. It currently has more than 100,000 members and associate members around the world. The association is supported and assisted by the Chartered Institute of Public Finance and Accountancy (CIPFA), the Institute of Chartered Accountants in England and Wales (ICAEW), the Institute of Chartered Accountants in Scotland (ICAS), and ACCA. AAT is committed to improving the professional capabilities and professional development standards of its members in the fields of accounting and other fields, and provides services to members through professional continuing education courses, professional regulations, professional ethics codes, etc. Where can I buy an Association of Accounting Technicians diploma?