dotty.
TV suppressors were fitted to the ignition systems in motor cars along with many household items. They prevented interference with television and radio. Any new or old appliance which contains a small motor and causes any interference with television or radio sets can be compelled to stop the interference. Some of the appliances which are most likely to cause trouble. In the home there are vacuum cleaners, sewing machines, hair driers, egg beaters, cake mixers, electric washing machines and electric floor polishers. In industry there are electric drills and tools of that kind.
Spare tyres are not compulsory, some new cars don't have one.