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Halfords, B&Q, Homebase, etc, etc all sell spray paint. Its not illegal.
If you are just looking for a smooth finish you can rent the sprayers that let you spray standard emulsion - attics are not known for ventilation so you will only be able to do very short periods of time with cans. Its also incredibly expensive. Wear a face mask.
Wandering around at night with a few rattle cans in a backpack is what causes questions.