dnsmasq in border router error

I'm trying the example border router using 2 x nRF52840 boards one with CLI and the other with NCP connected to a PI. I can get ipv6 addresses and get them to ping each other but can't get a 2001 ip address (no internet connectivity). Looking at the system log for Openwrt I see the router fails to start the dnsmasq service with the error 'failed to create listening socket for port 53: Address in use'. So there is a conflict on port 53 between bind named which has already started and dnsmasq. How do I fix this?