Date of award : If you get a decision to award PIP, entitlement to DLA ends four weeks after the next DLA pay day and the PIP award will begin on the following day. So if the decision is just after your pay day, the PIP award may not start for almost 8 weeks. Unfortunately, this will be the case even if the PIP award has resulted in an increase in your entitlement (unless you asked for your claim to be re-assessed under special rules for terminal illness.
If your PIP claim is turned down, DLA entitlement will still run on for four weeks after your next DLA pay day. (PIP(TP) Regs, reg17).
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems