W
website
Not web site.
while
Not whilst.
workplace pension
No need to capitalise when we’re talking generally about workplace pensions. Like all products, you can capitalise ‘Workplace Pension’ if it’s part of a Standard Life product name.
who
Never whom.
wifi
Not WiFi or Wi-FI.
X
Y
year-on-year
Hyphenated.
years
Write our years in full (for example, 2022 not 22 or ‘22).
When you’re showing a range of years, write ‘to’ rather than using a dash or hyphen (for example ‘2021 to 2022’ not 2021-2022).