Osmo Extreme Gel Spray 250ml – £5.72 @ Amazon

Salon-quality vegan gel spray that locks in styles with serious hold without the crunch. Osmo is a well-known UK hair brand, and this extra-firm formula fights frizz while adding a glossy finish — handy if you have wavy or curly hair and want definition that lasts. At under £6 instead of nearly £13 RRP, it is a proper bargain for a 250ml bottle that would normally cost double on the high street.