HMRCInformation on UK tax, VAT, National Insurance, customs and excise
Companies House
The official UK government register of UK companies
Charity Commission
The official UK government register of UK charities
ACCA
Association of Chartered Certified Accountants
Financial Reporting Council
United Kingdom’s independent regulator responsible for promoting confidence in corporate reporting and governance
Chambers of Commerce
The British Chambers of Commerce representing UK business interests around the world
Bank of England
Central Bank of UK. Best source of exchange rates etc.