Okay found a few things trawling the net.
Apparently there is an issue with 810 and mounting the /dev/.static/dev as ro
Don't quite understand the details but adding the following line into fstab remounts it as rw and allows dvb-utils to install.
/dev /dev/.static/dev bind remount,rw 0 0
Next issue then becomes the next step:
sudo scan -o vdr -p -u /usr/share/doc/dvb-utils/examples/scan/dvb-t/au-Townsville > channels.conf
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
main:2247: FATAL: failed to open '/dev/dvb/adapter0/frontend0': 2 No such file or directory
Seems to be a similar permissions issue.