Rather than reboot within the UTM to test failover (as I have been doing), I actually shut the UTM 1 vm down and the UTM 2 vm did take over in exactly the same fashion eg 1 ping dropped between the lan & dmz's but a 30 second delay with the wan (PPPoE) I suspect this would work fine with an ethernet connection (authentication done elsewhere) but because it's a PPPoE connection with authentication on the UTM, I am indeed at the mercy of the ISP authentication unless Sophos could come up with a way of not instantly dropping the connection straight away
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