@Sunshine I can only access the MR600 remotely at the moment and I can't see any way to access the Advanced options so this will have to wait until later in the month too, I'm afraid.

@CDC1951 Yes, the data displayed on the MR600 was incorrect. I'm sorry to say that the problem is quite as I thought so I'll have to wait until the end of the month to get further details.

I've set my monthly data to start on the 1st day of the month but doesn't seem to ever reset and just carries on increasing.