Or just don't buy stuff from the tax-dodging tw@s, then you're guaranteed to know which emails are scams.
I know the media likes to pick on big companies. But 1000's of UK companies, large and small, are at it.
In the uk ANY company can open a subsidiary in luxemberg or Ireland where corporation tax is low and have all profits fed into that foreign subsidiary so tax is paid there instead of in the UK.
The small company doodah works like this.
UK company creates a subsidiary company in luxemburg or Ireland and passes ownership of something (anything such as a logo or product design, drawing or some other worthless intellectual property) to that foreign company.
Foreign company doesn't actually do any work. Probably doesn't have any staff.
Near the end of the UK company's financial year they look in their accounts to see what their taxable profit is going to be.
Foreign company then, coincidentally, sends an invoice for "Use of Intellectual Property" to the UK company that, basically, wipes out UK company's profit.
UK company has no profit so doesn't pay uk tax. The foreign company pays tax at that country's (lower) rate.
The way to combat above wheeze would be to lower UK corporation tax so more uk companies would be more willing to pay their tax in the uk. But saying that would lose votes. Voters really like the sound of it when labour say they'll raise tax on business. It gets workers' votes but doesn't actually raise any tax.