Table of contents

  1. Writing numbers
  2. Number rounding
  3. Generalised numbers
  4. Millions and billions
  5. Page numbers
  6. Plus and minus
  7. Fractions
  8. Percentages
  9. Dates
  10. Time
  11. Ages
  12. Money
  13. Measurements and units
  14. Telephone numbers
  15. Superscript and subscript

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Telephone numbers

When writing telephone numbers, remove the leading zero from the number and replace it with the UK’s international dialling code: +44. Add a space between this code and the rest of the number. 

You should not: 

  • include the zero you’ve removed in brackets; this is particularly important for accessibility as it can affect how some assistive technology reads the number  
  • use 00 instead of + (it does not work from all countries) 

0345 601 3034 should be written as +44 345 601 3034
01633 456900 should be written as +44 1633 456900

Not

+44 (0)345 601 3034 or 0044 345 601 3034
+44 (0)1633 456900 or 0044 1633 456900

 This is in line with the UN’s International Telecommunication Union standards, which are recognised worldwide.