Boots extends its 'Price Advantage' promo – but how good are the deals?

In January, Boots introduced a discount scheme for customers with its Advantage loyalty card, giving exclusive deals when shopping in store (similar to Tesco's 'Clubcard Prices'). It's now extended this 'Price Advantage' offer to online shoppers and says it's added 100+ more products to the promo – so I've crunched the numbers to see if the deals are actually any good.