From Monday, Boots will be holding their delayed (from Christmas) 70% clearance. The clearance will be instore only. The sale should include most of the items still remaining from their annual Christmas gift range.
Please note that stores are likely to be very busy on Monday when the word spreads about the sale. Overall stock availability is unknown; some stores may have very limited, if any, stock remaining.
Examples (should be reasonable availability nationwide as these products feature in the article linked below):