A Sudbury beauty salon is taking a unique approach to expanding its business – by going underground. Lipstick & Locks in North Street is opening its new cellar extension this weekend, adding a second storey to the business to help meet customer demand. In addition to increasing its capacity for the usual hair and beauty services, the cellar also features a brand new Japanese head spa. The unique form of scalp massage treatment has been popularised in London salons in recent years, after the practice was brought over to the UK from Asia. Abbie Goodwin, senior staff member at the Lipstick & Lock…