Brash had a veterinary clinic called Battle Flatts surgery in Pocklington that he started on 8 September 2001. He later opened three more practices in Stamford Bridge, Strensall, and Norton-on-Derwent, and began attending weekly at Flamingo Land zoo, though he saw the small animals from Flamingo Land at Pocklington to allow him to be at his practice more. One of his most serious injuries as a veterinarian was caused when a white rabbit bit his wrist and opened an artery. In 2010, national veterinary chain CVS purchased Brash's four veterinary practices, which had nine veterinarians and 31 additional employees on their staff. After the transaction, Brash departed from the Ark Alliance, his veterinary group that owned the clinics. Between August 2008 and August 2009, the company had £1.8million (US$) in revenue and a before-tax profit of £141,000 (US$). Brash is a member of the British Veterinary Zoological Society and was vice president of the society in 2014.
