RobbiiuK

Hi Peter, Thank you for your suggestion. Amending the LAN IP hasn't made much difference. I've almost certainly isolated the issue to CELL WAN having the Default Gateway enabled/re-enabling itself when it's been disabled. Do you have any other suggestions? 

Hi Peter, Thanks for your response. Please forgive my ignorance, but may I ask how changing the LAN IP to the address provided would solve my issue? Just so I understand as I'll need to apply this change to all of the routers. Thank you.