The rates
Band 1: +50% on Saturdays and nights, +100% on Sundays and bank holidays. Band 2: +44% and +88%. Band 3: +37% and +73%. Bands 4 to 9: +30% and +60%. Nights run from 8pm to 6am.
Estimates only, using national rates. Your payslip and your employer's policies are what count.