Hi george,
If you are undertaking " natural migration " to UC then you have to be careful that there aren't any gaps in your claims. So don't close your Legacy Benefits ( ESA, IS, JSA ) claim yourself. You don't need to as when you claim UC the Legacy Benefit claims are automatically closed and in most circumstances cannot be re-opened. This applies to all three types of UC Migration. (Natural, Managed and Voluntary )
Hope this helps,
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems