Hi Maurice,
There are two issues here.
Firstly, the reassessment date is only advisory.
Secondly, due to an enormous backlog of cases, many reassessments have been suspended for the time being.
It might be worth checking with DWP to ensure that forms have not been sent out and gone astray (which could result in your claim being closed due to non return of the forms).
It is also possible to make a start on the pdf version of the ESA50 and keep this up to date so that you won't have to do much when the forms do arrive.
Using The PDF Version Of The ESA50 Questionnaire Other than this, there is not much you can do for the time being.