My economy 7 digital meter is showing me using
R1 = 65kwh per 24 hours
R2 = 23kwh per 24 hours
Surely this is back to front, I thought R2 was the night time units, I
cant be using 65kw daytime and only 23kw at night with 5 storage
heaters.

It varies depending on the particular meter and tariff. I used to be on
Option 14 and the rates were "opposite" to Economy 7 on the readouts - I
don't believe I received a single correct bill for over 6 years until I
went back to a standard meter once CH was installed - and I work for the
company !