jilks
It's not impossible that will reassess your ESA but it is extremely rare for this to happen, if they do then your current award remains in payment until a new Decision is made on your claim.
You have one month to decide on whether to request an MR or 13 months to make a Late request for an MR with your reasons for the delay.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems