Paula
Whilst we have seen a limited number of ESA reports used to help make an PIP Decision we have not seen one used to remove a PIP award or even to cause a re-assessment of a PIP award, in fact the then Minister specifically stated at the introduction of PIP, in the House of Commons, that the DWP would not be doing this.
If you still want to withdraw from your ESA claim, then you can do so at any time with no fault, but you would obviously lose the chance to receive upwards of a £100 per week in benefits, so this is not something that you should do without considerable thought.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems