I am on a Powershift tariff. What are the times for each of the rates?

Low Rate: Mon - Fri Midnight to 8am; Sat/Sun 7pm to 8am
Normal Rate: Mon - Fri 8am to 4pm; Sat/Sun 8am to 7pm
Peak rate: Mon-Fri – 4pm to 7pm
The times stated above are all GMT, please add one hour for British Summer Time. i.e. midnight to 8am will be 1am to 9am.