IO540, thanks for the info about GPS accuracy. My initial point was not to do with the private owners who may which to be flexible with MDA but to the burgeoning public transport operations who can ill afford to be flexible at MDA.
In the event that a mishap befalls a public transport /AOC flight the CAA,lawyers and AAIB will all have access to the GPS memory plots which at the moment are not approved as an IFR approach aid.
back to original point...is the DME to be reinstated and when?