At this purse-draining time of year I love an offer, especially when it's on something I buy anyway. Starting today when you buy two 500ml bottles of diet coke (one of my daily essentials) you get a free Models Own Lipgloss, worth £5. The tricky part will be deciding which limited edition shade to go for - Lacquer Red, Glossy Pink, Pure Plum or Golden Nude. Too hard to decide? Then collect all four. I'll see you in the queue at Boots.