Connect a Land Rover specific diagnostic tester, take note of the fault code(s) and then clear the codes. Drive around and see if the ABS light comes back on. If it does come back on, connect a diagnostic tester, check for fault code(s) again and Google it or post the fault code here in the forum for more help.
Here at LandyZone we have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.