I can think of one (er, and ONLY one) scenario that the LA may be trying to avoid.
In the first instance, the clmt has an undeniable duty to notify the LA of a change in circs - IB is a notifyable change (even if it can be obtained elsewhere).
But, in this case, the LA *could* use the RAT. But, the scenario suggested is this: What if the info from the RAT / CIS is wrong? It may well be possible to argue that any resulting o/p is as a result of the LA's actions. After that, it's a bit of a crap shoot as to whether the clmt contributed to the mistake, or if he could reasonably have been expected to realise etc.
By insisting that the clmt should supply the info (as he is, in any case, legally required to do), the chances of an LA error are massively reduced.
In case anyone is thinking that "Kerr" places the LA under any obligation, or that the clmt doesn't have a duty to notify a change in IB directly to the LA, CH/687/2006 is an interesting read (I'm not sure if this CD is being appealed further).
The above is offered purely to suggest a *possible* reason for the approach taken by the LA - I'm not necessarily trying to justify the action.
Regards
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