Solution 01

    var aCar = {
        owner : 'Joe Bloggs',
        type : {
            make : 'Toyota',
            model : 'Corolla',
            cc : 1.8
        },
        registration : '10WD1058'
    }
    console.log(aCar.owner + ' drives a ' + aCar.type.make)

Solution 02.

    var aCar = {
        owner : 'Joe Bloggs,
        type : {
            make : 'Toyota',
            model : 'Corolla',
            cc : 1.8
        },
        registration : {year : 10, county : 'WD', number : 1058}
    }

    console.log(aCar.owner + ' drives a ' + aCar.type.make)
    console.log('Reg. = ' + aCar.registration.year + '-' +
                            aCar.registration.county + '-' +
                            aCar.registration.number )

Solution 03.

    var aCar = {
        owner : 'Joe Bloggs',
        type : {
            make : 'Toyota',
            model : 'Corolla',
            cc : 1.8
        },
        registration : {year : 10, county : 'WD', number : 1058}
    }

    console.log(aCar.owner + ' drives a ' + aCar.type.make)
    console.log('Reg. = ' + aCar.registration.year + '-' +
                            aCar.registration.county + '-' +
                            aCar.registration.number )

    aCar.mileage = 80000
    aCar.color = { exterior : 'red', 
           interior : { texture : 'leather', shade : 'cream' }
         }

    console.log('It is a ' + aCar.color.exterior + 
                 ' car, '  + aCar.mileage + ' mileage, and ' + 
                 aCar.color.interior.texture + ' interior.')

Solution 04.

    var aCar = {
        owner : 'Joe Bloggs',
        previous_owners : [ { name : 'Pat Smith', address : '1 Main Street'}, 
                            { name : 'Sheila Dwyer', address : '2 High Street'}],
        . . . . . . . . .
        registration : {year : 10, county : 'WD', number : 1058}
    }
    . . . . . . . . 
    console.log('First owner : ' + aCar.previous_owners[0].name + 
                 ' - ' + aCar.previous_owners[0].address )

Solution 05.

    for (var i = 0 ; i < aCar.previous_owners.length ; i += 1) {
        console.log(aCar.previous_owners[i].name)
    }