Found this lovely pink No7 nail varnish at the Lincoln store. £3 each (normally £6) and 3 for 2. I spotted this colour reduced in another Boots store a couple of weeks ago so it may be a discontinued colour? It may be worth a check in your local.
Also the £3 off coupon you get given to you at Boots worked on this deal too so I got 3 varnishes for £3 total. The voucher will probably work with other sale items too.