user: Question: What is the regulated retail price for the tariff code ff0 PRS?
Columns: ['Scheme', 'Tariff code', 'BTs retail price (regulated)', 'Approx premium', 'Prefixes']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Pence per call, fixed at all times', 'ff15', '5.10p/call', '7p/call', '0871, 0872']
SQL:

assistant: SELECT "BTs retail price (regulated)" FROM "Table" WHERE "Tariff code" = 'ff0 PRS';