Gordon Brown reduced VAT (from 17.5% to 5%) on sanitary products from Jan 2001, during the UK's EU membership, .
Since 2018, they've been available free in schools and universities in Scotland. Leaving the EU allows Westminster to scrap the tax a year early, but if the issue had been dear to recent government's hearts, they could have done what Holyrood did 2 years ago. Or voted for free protection for all who need it, as has just happened in Scotland. Those measures were possible while the UK was an EU member.
It will be interesting to see whether shops apply the reduction fully or adjust their prices.
Today, Sainsbury's and Asda both charge £2 online for 18 regular Tampax Compak; Ocado charge £2.75.
Sainsbury's charge £1.50 for 16 regular Lil-Lets; Asda charge £1.50, reduced from £2; Ocado charge £1.90.
That's a difference of far more than 5% simply according to where you shop (although some places had multibuy offers, which aren't included above, as I was just looking at price per packet).
Might be worth keeping an eye on those prices once the tax is scrapped next January. Although prices in general may well have risen by then...