Double-Barrelled x Siren | Mirrorball | 5.2% £5.10 / Tax included. Default Title Default Title Add to Cart Your Email Send This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Like a mirrorball, this hoppy Porter reflects complex layers from a parti-gyle style brew of rich, smooth chocolate, biscuity notes & a subtle undertone of coconut & tropic berries.