Hi JLH153
If you ring, they may agree to send you a copy of the form; however, they may insist you put in an SAR Subject Access Request, which is the normal procedure for accessing old records. You won't necessarily get a quick response. I'm sorry you don't have your old records, but if you can keep every communication with the DWP.
The DWP don't have an email address people can use as standard. You would have to get permission from them - which you would need to do over the phone.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems