I own a LOT of Make-Up Brushes. Having tried every make from MAC to NARS, my favourites are still my Real Techniques Brushes. They are very popular and are reasonably priced for the quality of them. If you like your make-up then you ought to try them especially since Amazon are selling them today with up to 60% off.
You can get the Real Techniques Deluxe Gift Set Collectors Edition* for just £12.14. This set includes Multi Task Brush, Tapered Foundation Brush, Angled Highlighter Brush, Base Shadow Brush, Fine Liner Brush all packaged in a Glam-to-go Clutch.
You can have your Real Techniques Bargains delivered for FREE when you spend £20+ or have Amazon Prime. If neither of those apply then it'll cost you £3.30.