Wishface,
Firstly, ignore what stranger wrote, because it, frankly, is wrong. The whole point of the appeal is that it gives you the opportunity to put how it really is to a doctor and a judge who then make a decision. They do not make that decision solely based on how you were at the WCA, nor do they make it solely based on how you appear to be on the day of the appeal hearing. Rather they take all that, any evidence you present, and what you say all into account.
Now, this is why it is so important to get an advocate, friend, or relative to go with you to the appeal hearing, if you can - because then it is not simply your word against that of the ATOS assessor.
Secondly, regarding you question about whther they can refuse to reinstate benefit, no, as soon as they receive your appeal request then they must reinstate basic rate ESA.
Wishface,
Firstly, ignore what stranger wrote, because it, frankly, is wrong. The whole point of the appeal is that it gives you the opportunity to put how it really is to a doctor and a judge who then make a decision. They do not make that decision solely based on how you were at the WCA, nor do they make it solely based on how you appear to be on the day of the appeal hearing. Rather they take all that, any evidence you present, and what you say all into account.
Now, this is why it is so important to get an advocate, friend, or relative to go with you to the appeal hearing, if you can - because then it is not simply your word against that of the ATOS assessor.
Secondly, regarding you question about whther they can refuse to reinstate benefit, no, as soon as they receive your appeal request then they must reinstate basic rate ESA.