Hello Richard,
Unfortunately if you lose your PIP you will also lose the severe disability component of your ESA. However, if you simply lose some of your award, but still have standard Daily Living you will keep it. If you lose your PIP at this hurdle, but later get it back as a result of a MR or appeal, the SDP will also be backdated.
Catherine
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
