The crux is whether or not the £10 difference constitutes a change of circumstances.
If it can be (reasonably) shown there have been no increases in charges / hours and/or significant change(s) in the customer base, it may well be that the difference simply reflects a degree of fluctuation that does not count as a change of circumstances.
If there has not been a change of circs, there would be no grounds for HB/CTB to be revised / superseded.
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