If your change of condition would mean that you are no longer eligible for the level of benefit that you now receive, I suggest you contact DWP straight away and inform them, also explaining why you have not done so before.
On the other hand, if the changes are such that they do not make any difference to the award you are receiving, I don't think there will be an issue.
Nothing on this board constitutes legal advice - always consult a professional about specific problems