How much caffeine does tetley tea have?

Tetley tea contains varying amounts of caffeine depending on the type of tea. On average, a standard cup of black tea, such as Tetley, contains about 40-70 mg of caffeine per 8-ounce serving. Green tea typically has less caffeine, around 20-45 mg per cup. Herbal teas, on the other hand, generally contain little to no caffeine.