Morrisons Data Services - Why so often?

I understand the occasional need for an outside company - In OVO’s case, Morrisons Data Services - to come and take a manual meter read in order to check customer honesty and meter integrity, but isn’t it supposed to be just once a year or every 2 years?

I’m due another visit, but I’m pretty certain they’ve already been round once this year, around February/March time.

I submit a manual meter read at least twice a month, as I like to keep on top of my energy bills and know roughly how much I need to put aside when the monthly bill is live, so I fail to see the need for Morrisons to turn up every 6 months.

I’ve followed the link in their email and submitted manual gas and electricity meter reads to Morrisons (with photographs!), so hopefully this time they’ve no need to physically visit.