The King's Fund house style: A

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acknowledgement
not acknowledgment

Act of Parliament

adviser
not advisor

A&E
use accident and emergency (A&E) in first instance

ageing
not aging

all right
not alright

alphabetisation
Order as follows:

Maguire
Maidment
McDowell
Mead

Sachs
Saint Xavier
St Claire
Sugden

alternative
of two; choice of three or four

among
not amongst

ampersand
use ampersands only in common phrases such as A&E but spell out in the first instance - accident and emergency (A&E) departments

annex
not annexe

antenatal
not antinatal

antisocial, anticlimax
no hyphen

apostrophes [']

  • used in possessive terms but be careful to check whether it is qualifying a singular or a plural noun - managers' meeting (meeting of more than one manager); organisation's objectives (objectives of a single organisation).
  • Collective nouns have an apostrophe before the s, eg, children's, people's, women's, men's, not childrens' etc.
  • Leave out the s when the last syllable of a name is pronounced 'iz' (eg Bridges', Moses'), but James's, Thomas's, Chris's. (Note an exception to this is St Thomas' Hospital, which forms part of Guy's and St Thomas' NHS Foundation Trust.)
  • Several hours' delay.

arm's length, also arm's length organisations (no hyphen)

authority
singular, so 'the authority is' (not 'the authority are')