my disco needs help

hi i am new to this site and to land rovers i have had my disco for 6months now had a few problems along the way but managed to get them sorted not easy
my problem at the moment is major my disco will not start tried everything
to start from the begining without going on to much i was on my way to work when my disco lost all power on the m62 finally got to work i came to start it next morning nothing thought battery flat sorted the battery new one still nothing got a mechanic he tried everything finally he put new plugs in as others were wet and had deposits on them car turned over then died plugs wet yet again and full of deposits mechanic says this is my problem flooding need a diagnostic test to find out why other problem my disco is stuck at work cannot tow it as it is aoutomatic will need to lift it but dont know anyone with diagnostic equipment for land rovers to take it to has anyone had same problem or any suggestions thanks

Any chance of a bit more info about the Disco?? Age, engine/petrol/diesel?? I'm guessing at petrol with the talk of plugs, if so, i'm not too fresh on them sorry..