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Whilst you must report any improvement in your conditions, the DWP are on the whole a lot less bothered if claimants don't report a deterioration.
The question to ask yourself is whether the deterioration is sufficient for you to receive a higher award, if you do and I would encourage you to be pessimistic in looking at the extra points you might get, then you should consider reporting a change of circumstances, if the situation is not clear then you might want to be more reluctant to contact the DWP.
Gordon