Thanks @abwaita
I did check this and my current settings are:
Tax Options
Yes I will enter prices inclusive of tax.
Shipping tax class: standard
Additional tax classes: reduced rates & zero rate
Display prices in the shop: including tax
Display prices in basket and checkout: including tax
Display tax totals: As a single total.
Standard Rate
Country Code: GB
State; *
Postal: *
City: *
Rate: 20.00%
Tax Name: VAT
Priority: 1
Compound: Yes
Shipping: Yes
