2nd question - do crash pads / impact shorts not give a better all round protection though for the hips etc?
Was thinking of an azzpadz but then thought, why not get that bit of extra cover.... in a pound for pound fall on the tail which do people think gives a better protection - impact shorts (say burton red or IPS) or azzpadz
I just ordered azzpadz and the demon flex x d30 pants
Purchase Demon Men's Flex Force X D3O Long Padded Pants | Padded Pants | All Sport Protection
Although with some photos of your girlfriends coccyx (less clothing prefered) I'd be able to make a more thorough reccomendation.
If I had a previous injury I would wear both. For me the pants are good enough (all though they are significantly thinner).