Thanks WillC, Mr Belle is looking at your post and nodding sagely; looks like his fears were well founded.
Seems that waxing the rest is OK, and so Mr Belle has made a compromise and will wax all areas except the scrotum, which as suggested will be taken care of with gel and a good quality razor.
Meanwhile Mrs Belle has seen 'photoepilation' which sounds similar to laser. Mrs Belle has had some laser depilation before, and while it does grow back after a while, it doesn't grow back as thickly and takes a while. Does anyone have experience of the photoepilation and can offer feedback as to whether or not it works better?