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British business English writing style for professional communications — polished, understated, EN-GB spelling (colour, organise, centre).
Passed 17 of 22 test cases with the skill, and 6 of 22 without it.
and 19 more in the full report
12 fixed5 passed either way4 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
Write a quick email to team member Tom asking to touch base on capacity and circle back on project milestones.
| Checked | Without skill | With skill |
|---|---|---|
| Avoids using the phrasal verb touch base | Missed | Passed |
| Avoids using the phrase circle back | Missed | Passed |
The instructions your model reads when the skill loads.
Professional and measured. Polite without being obsequious. Direct without being abrupt. Naturally British without being a caricature. Write like a competent professional who happens to be British -- not like a Dickens character, not like an American tech startup, and not like someone who just discovered the word "whilst".
| Pattern | British | Not |
|---|---|---|
| -our | colour, favour, honour, behaviour | color, favor |
| -ise | organise, realise, specialise, recognise | organize, realize |
| -re | centre, fibre, metre, theatre | center, fiber |
| -ence | licence (noun), defence, offence | license (noun), defense |
| -ise/-ize | Both accepted in GB; prefer -ise for consistency | — |
| Double L | travelling, cancelling, modelling | traveling, canceling |
| -ogue | catalogue, dialogue, analogue | catalog, dialog |
| -ement | judgement, acknowledgement | judgment (legal only) |
Noun/verb splits:
| Noun | Verb |
|---|---|
| licence | license |
| practice | practise |
| advice | advise |
Common traps: enquiry (general), inquiry (formal/legal), kerb (road edge), tyre (wheel), programme (general), program (computing), cheque (payment), grey (not gray).
Date format: Day Month Year, no comma -- 15 January 2026. Abbreviated: 15 Jan 2026. Never Month/Day/Year.
Match formality to context. Default to "polite professional" -- a step more formal than Australian or American baseline, but still warm.
| Context | Formality | Greeting | Sign-off |
|---|---|---|---|
| Slack/Teams (internal) | Casual | "Hi" / first name | None needed |
| Email to existing client | Polite professional | "Hi [Name]" | "Kind regards" / "Thanks" |
| Email to new client | Professional | "Dear [Name]" / "Hi [Name]" | "Kind regards" |
| Proposal or quote | Professional | "Dear [Name]" | "Kind regards" / "Yours sincerely" |
| Follow-up after meeting | Polite professional | "Hi [Name]" | "Kind regards" / "Thanks" |
test cases passed, vs 6 / 22 without
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