Sir Billy Connolly has teamed up with an Edinburgh-based chocolatier to design a special chocolate bar to raise a smile as well as some much needed funds for NHS charities.The Big Yin was asked by artisan chocolate firm COCO to help create a new take on the brand's single origin ethical chocolates to pay homage to the outstanding work carried out by National Health Service workers during this difficult time.The three COCO x NHS chocolate bars feature artworks kindly donated by Sir Billy, as well as fellow artists Andrew Rae and Portia Wasp.The ever popular comedian's ‘Blue Angel’ artwork will show off his talents as an artist and feature on the limited edition of the Isle of Skye Sea Salt Dark Chocolate Bar.A spokesman for Sir Billy at