Is it more economical to buy the new cv joints and fit to the existing driveshaft or would I be best just buying a recon drivveshaft? ie How much of a pian in the arse is it to do just the cv's?

its a real pain in the arse doin cv joints but its all part of the fun, i think you would be mad to buy recon parts unless the inner and out joints need doin which probably dont. head to your motor factor get your part and bang it in

Inner or outer?

both I think? How do I tell? There is movement in the whole shaft.