Companies House: https://www.gov.uk/government/organisations/companies-house
HMRC Services: https://www.gov.uk/log-in-register-hmrc-online-services
HMRC Gov.uk: https://www.gov.uk/government/organisations/hm-revenue-customs
Income Tax Rates & Personal Allowances:https://www.gov.uk/income-tax-rates
Corporation Tax Rates & Reliefs: https://www.gov.uk/corporation-tax-rates