In some respects, true, but that isn't always the case.
Say you own a company in the UK which sells widgets, but you also own an offshore company that also sells widgets. If you are dealing with a Chinese company, you could use the offshore company to do the deal, paying little to no tax. The money then resides in the offshore company and has never gone through the UK - either as a business or personal. As an individual you could own a credit card that you use to spend in the UK, which goes back to the offshore company. In additional, the offshore company could buy property in the UK and no tax is paid. There are various other tricks and nuances that can be employed to help minimise tax paid - completely legally.
Say you own a company in the UK which sells widgets, but you also own an offshore company that also sells widgets. If you are dealing with a Chinese company, you could use the offshore company to do the deal, paying little to no tax. The money then resides in the offshore company and has never gone through the UK - either as a business or personal. As an individual you could own a credit card that you use to spend in the UK, which goes back to the offshore company. In additional, the offshore company could buy property in the UK and no tax is paid. There are various other tricks and nuances that can be employed to help minimise tax paid - completely legally.