Hi Greyabbey2
Your PIP award is safe for now, it will be at risk when your PIP is reviewed.
As for your NS ESA, this can last for up not one year, if you are placed in the support group then your NS ESA is indefinite, until you are re-assessed and found fit for work/LCW.
When you claim NS ESA, your partners income is not taken into account.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems