gaz
The general rule is that a claimant is not entitled to ESA is any week that they work unless the earnings are disregarded, as your earnings would exceed the Permitted Work limit they would not be disregarded.
As far as I can see this does not close the ESA claim, just prevents payment.
You must notify the DWP within 30 days of your doing the work.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems