Not using minimization,
I've set a domain override for that now so it uses 1.1.1.1, it resolves but its really slow see below how long it takes to resolve (Query time: 2051 msec) compared to doing a dig directly to 1.1.1.1 (Query time: 17 msec)
stevetozer@Steves-MacBook-Air:~$ dig epdg.epc.mnc020.mcc234.pub.3gppnetwork.org
; <<>> DiG 9.10.6 <<>> epdg.epc.mnc020.mcc234.pub.3gppnetwork.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25550
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;epdg.epc.mnc020.mcc234.pub.3gppnetwork.org. IN A
;; ANSWER SECTION:
epdg.epc.mnc020.mcc234.pub.3gppnetwork.org. 2677 IN CNAME epdg.epc.wip.mnc020.mcc234.pub.3gppnetwork.org.
epdg.epc.wip.mnc020.mcc234.pub.3gppnetwork.org. 1 IN A 188.31.254.71
;; Query time: 2051 msec
;; SERVER: 192.168.50.1#53(192.168.50.1)
;; WHEN: Sat Jan 04 15:35:46 GMT 2020
;; MSG SIZE rcvd: 114
Thanks for all your help with this