Rail and bus closed circuit television maker 21st Century Technology has won a £3m contract extension with an unidentified major UK bus operator.The group said it had renewed an existing deal through to February 2017 to supply, fit and maintain CCTV systems on the customer's bus fleet.Chief executive Russ Singleton said: "We are delighted to be continuing our long-standing relationship with this market leading bus operator."Shares rose 0.13p or 2.7% to 4.75p at 09:11 in London.