moraveen
The MR should be done a new, more senior Decision Maker.
If there was medical evidence that missed the assessment then it's likely that the DWP will refer it back to the ATOS (IAS) for their comment which would delay the process.
We quote 5-8 weeks for an MR on average so you are still within this period, I would check back with them weekly for an update.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems