It is a loopy price to pay. In my experience when I've seen somebody with shiny shiny hair and I've asked them, it's been down to a mixture of luck, Tresemme, coconut oil. Back in the day I asked a mate of mine how she got her hair to look so shiny and lustrous and she said "Sainsbury's egg". I tried it myself and sadly it didn't have the same effect, it was ok as shampoos go but luck plays a bit part. Don't see egg shampoo nowadays and what about Linco Beer? Now there's a blast from the past!
I've learned that if you're gonna spend a lot of money on your hair a good cut from a good hair dresser is the best starting point, and a good detangling brush. If your hair doesn't tend to shine through shampooing/conditioning alone, then a spritz of olive oil spray does the trick (not the cooking one lol). No need to wash it every day as I've heard that creates an unbreakable cycle and imagine how quickly you'd get through £40's worth of shampoo?
In the case of Tweak'd £40 represents a massive saving. If it was £20 then perhaps I might be tempted to give it a go as to me that's a fair price for a huge bottle of a premium product, and if it didn't prove to be premium, I wouldn't buy it again - no harm done!
, but thereagain what do I know. 
