Got some advice from the content community:
> I don't think we have a style on this - it doesn't really come up on
> GOV.UK mainstream.
>
> In your example, I'd go with something like 'less than £250 before
> VAT' or 'less than £250 (not including VAT)' to make it as clear as
> possible. Would that work?
I’ve gone with ’less than £250 (before VAT)’. I noticed that elsewhere
we’ve said ‘Each message costs 1.58 pence (plus VAT)’ so that feels
fairly consistent.
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