Octopus Watch
Apart from the Lux software to monitor the system I have been using the following to research Octopus Agile pricing
Octopus Watch written by Smarthound is a great app for tracking the Octopus Agile pricing slots.
Kim the developer has been very responsive to all my questions and very detailed in his replies. From his replies you can tell he is passionate about this subject and his application
I subscribed to the app within minutes of downloading it. These are some of the key subscription features
On the Rates tab, in the table, you can tap each row to see the carbon emissions of that hour (either local, or national);
On the History tab you can tap each row for the day detail view with a lot of specific statistics. If you tap the graph you can see a half hourly overview of your usage and cost;
On the History tab you can tap on the button on the top right to create customised energy reports.