First IS claim - 17/01/08 DLA awarded from - 20/05/08 Second IS claim - 15/01/09
DLA doesn't invoke a DP until it's awarded and as this was four months after the IS claim it does not help. Therefore, it is not correct to say that if IS had been refused altogether it could now be backdated since there would still be no DLA to give rise to a DP. If would have been a different matter if the DLA tribunal had been successful.
Furthermore, the situation wouldn't arise if benefit was awarded (straightforward supersession), which is why reg 6(16) only refers to 'refusal' of benefit.
In your case, it's pretty straightfoward. IS entitlement legitmately ended in Jan 08. DLA was awarded on 20/05/08 so this could be taken into account when assessing any new IS claim, which happened to be on 15/01/09. Backdating is limited to three months with applicable grounds.
The only way around this would be for your client to have made a 'protective claim' for IS at the point where he reclaimed DLA on 20/05/08. Had he done so, and reclaimed within 3 months of the DLA award, IS could have been backdated to the start of the DLA award. In that case, the circumstances would fit exactly reg 6(16).
Hope this helps,
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