GB - as mentioned above, the 'one centre taking over from the other' is only theoretical; never been tried or tested; and even according to the script, the first response would be about 3 days later!
'Max' capacity, which would still be way short of normal, would take about 1 - 2 weeks to achieve.
And that's after all the spare controllers get moved to the recovery centre. Oh, hang on - we don't have any spare controllers.....