I just bought a Digifob off ebay £ 26 well spent I think and It arrived today in the post wow when i used it to check my tacho card it went back all the way back tIll april 2011 with my card Hystery 
only 4 minor infringments which I knew about and have the printouts for …with the reasons writen on the back of .
Well worth the money for peace of mind eh .