Hi Carol
You still have to send back the form by the 19th April.
PIP review forms have been coming out 6 months before the end of an award end date.
The DWP knows it will be difficult for people to collect current evidence. If it is a review they will have what you sent in before and they will be able to speak to anyone if they think they require further information.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems