Hi JoFrog
It's perfectly acceptable to type all your answers on additional sheets. Don't staple them - punch a hole and use string, a tag... whatever to hold them together. They have to take staples out and sheets can easily be dropped. Also, make sure that you number every sheet as well as putting the question number.
As far as writing in the box, you don't have to write anything - but I tend to write - "See Additional Sheet No1 " etc
It's fine to use your ESA medical report and show that you were given support, but you need to actually say in your evidence why it is relevant - because there are differences between PIP and ESA.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
