SNMP on Technicolour DGA0122

I've recently had to change router to a Technicolour DGA0122.  There appears to be very little documentation for this model, so RTFM doesn't seem to work.
With my previous Draytek router, I was able to monitor the byte count between the router and the Internet, and I'm hoping to do the same with this one, but thus far I've drawn a blank.  The user interface that I get from logging into the router from my browser shows SNMP, and claims that it is turned on (no other information or options on it are shown). However, when I try to access it, using either snmpwalk or snmpget, I get a response of "Timeout" and nothing else.
Has anyone successfully managed to use SNMP to get data out of one of these routers ?, and if so, what are the magic incantations ?
TIA
Adrian
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