Thanks David, Yes I did look at the web usage section and you are able to compare time periods, but I find that I access the web interface very infrequently (in fact the only time I have really used it is to check this function!). I use the app very often to submit meter reads and check usage/costs and find it is a really accessible and quick way to access the info. Even if the app showed 13 months of data you could see what your equivalent usage was at the same time last year (although 18-24 ...