table: 1-10408617-5
columns: Scheme, Tariff code, BTs retail price (regulated), Approx premium, Prefixes
Q: What prefixes are priced at pence per minute, fixed at all times with a premium of 3p/min?
A: SELECT Prefixes FROM 1-10408617-5 WHERE Scheme = 'Pence per minute, fixed at all times' AND Approx premium = '3p/min'