Another problem you will have in moving the consumer unit is that the switchfuse will not fit into the meter cabinet, as it is already full of other equipment. Even if the E7 gear is removed, the DNO will not allow you to put the switchfuse in the meter cabinet anyway.
Might be worth writing a letter to ask. I wouldn't bother phoning them, as you'll very likely speak to some bozo who won't even understand the question you're asking.