Firstly, welcome to the Community 😄
Unfortunately, at the moment, there is a slight system constraint which prevents us from merging your two accounts under one account number (not ideal I know, and this is something being looked into)
As you have both gas and electricity, we would need them both under the same account number for us to be able to book this. This is because once the Smart Meters are installed, they need to be under the same account number for them to function properly within our system.
I'm afraid I'm unable to provide a time-frame for when this will be possible, it's been being worked on for a while now so hopefully soon 🤞