I’ve changed from THTC to Economy 10 (by the fitting of a new smart meter) and this is reflected in my online account.  After installing the OVO app on my phone and logging in, it tells me ‘our app does not currently support complex meter setups’.  I know that THTC was considered ‘complex’ but is that really true of Economy 10?  It would be odd, I think, if only those with a single rate tariff could use the app.