Scegliau - thanks for your response.

The discussion you link to suggests that Kismet still has problems even using this driver but actually I am more interested in packet injection using aireplay-ng. Does this driver support this? I would try it out for myself but this brings me on to my second question:

The link for instructions on inserting it goes to a garage page with the CX3110X driver are not that clear. From what I can gather it's necessary to:

copy your module to device
rmmod umac.ko and cx3110x.ko
insmod umac.ko and your cx3110.ko
chroot /mnt/initfs /usr/bin/wlan-cal

As someone with limited Linux this is somewhat unclear to me. Does anyone know what the correct series of commands would be to achieve this?

I am tempted to try
rmmod umac.ko
rmmod cx3110.ko
# which presumable removes these modules (what is umac.ko)
# then
insmod umac.ko #where is umac.ko. Do I need to specify a path?
insmod cx3110.ko (presumabaly the new version)
chroot /mnt/initfs /usr/bin/wlan-cal
# what is wlan-cal?

Anyone have any guidance. I am loath to try this and find I have bu**ered up my system. Any help from someone who knows what they are doing gratefully received!