Client is on IS, reduced by 20% waiting for the outcome of a incapacity for work appeal. DWP guidance says she can't claim ESA because the Welfare Reform Act says if you are entitled to IS you can't get ESA. Anything to stop the client from withdrawing her IS claim to claim ESA?

The linking rules?

The linking rules link periods of incapacity. Since they don't think she is in one they don't affect her.