I bought Sunny Day from the Kitchen during their Oxford Street exclusives week but it's since been rolled out nationally so you can pick it up in your local store. Interestingly, the label describes it as a detangler but this isn't mentioned at all on the site. Instead, it's sold as am anti-frizz spray to keep your locks smooth and silky.
The bottle I bought is 250g and pretty massive, which is good if you're going to use a lot, but I'd probably start with the 100g bottle. It has an easy-to-spray pump mechanism so you can spritz it all over your head without contorting your body into strange positions (just me?).
Let me tell you, this stuff smells incredible! Ingredients include lemon juice, honey and ylang ylang but the fragrance is 100% violets. If you like the scent of Parma Violets, this is the hair product for you! In fact, I even got compliments on how nice I smelled so it travels well!