Pickle - In a large bowl, dissolve the salt and sugar in the hot water. Stir in vinegar. Add carrots and daikon - they should just about be covered.
2 hours - Leave for 2 hours until the vegetables are slightly floppy.
Using - Drain well to use, or just take out what you need (no liquid, just the vegetables).
Storing - The vegetables will keep in the fridge for 2 months, in the pickling liquid. Use airtight glass containers or jars (not plastic).