A "57 disco 3" is a UK LR3 with a "57" registration plate - I'm guessing 2007 model year. In UK the registration plates are tied to the year of registration, and generally don't change when the vehicle changes hands unless a vanity plate transfer is involved.
But without being able to get fault codes, yes it's a guess at what the problem might be. Could be the infamous brake switch or rear tail light bulbs issue. It could also be the battery if you can't start it....the LR is electronics laden so all kinds of weird stuff happens when you don't feed it enough volts and amps....
But without being able to get fault codes, yes it's a guess at what the problem might be. Could be the infamous brake switch or rear tail light bulbs issue. It could also be the battery if you can't start it....the LR is electronics laden so all kinds of weird stuff happens when you don't feed it enough volts and amps....