J
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As you don't explain why you need to claim PIP in October it's a little bit difficult to offer advice, if it is because a DLA award will end then, then I would expect you to be contacted about claiming PIP about 20 weeks in advance.
I would inform the ESA department as soon as you have confirmation of the rate at which your pension will be paid at, the notice needs to be in writing and I would chase them if you have not heard back within four weeks.
Gordon