find spares and a repairer?

I too have an old Jackson Highline electric cooker boughtin 1961/2 It is excellent incorporating many features you can't find on modern cookers but some hotplates need replacing. They work but take too long to get to the temperature required for cooking. The oven and grill/rotisserie work perfectly. I live on the Hampshire Surrey border. Can anyone suggest a repairer or where I can get spares. I'm 73 and have cooked on this Jackson since I got married at the beginning of the sixties.