I have now re-listened to the podcast which seems very recent. His supporters apparently worked with Bamber's legal team on the submission for the review people. I made the following notes and it seems some form part of the submission
1. Police surgeon didn't take temperatures. Had he done it would have showed Sheila died 4 or 5 hours earlier.
Is it possible to be so precise about when someone actually dies?2. They [unsure exactly who "they" refers to] know Bamber is innocent.
What reason would the system have for framing an innocent man?3. Claims Mr Bamber Snr called the police.
PC West seems to deal with this adequately in the doc.4. Claims Julie smuggled drugs from Canada.
What evidence exists to support this?5. Claims Sheila wrote a suicide note stating "I have just killed myself".
This certainly requires some explanation! The deceased writing suicide notes 
6. Claim Jury was misled about who went on to inherit Mr and Mrs Bamber's estates.
Thought this was dealt with in a previous submission?7. Claim to have found the grey hair and that it did not pertain to Mr Bamber snr.
Thought the biologist at trial said it held little forensic value so doubt jurors placed much weight on it. Although I believe judge mentioned in his summing up.8. Claim 2 silencers were used to convict Bamber. Talk about Robert Boutflour's blood group in silencer. Also add 8% of population have same blood groups.
How would Robert Boutflour's blood get inside silencer.9. Claim police disturbed scene.
10. Claim lights/curtains on/off/opening/closing.
11. Claim Sheila made a 999 call.
12. Claim crime scene photos showed windows secured.
13. Claim burns were not caused by a person but unable to say what they were caused by as do not want to give the police a headstart.
Yvonne claims she is very confident the review people will refer to the appeal courts. I think she might be disappointed. Since watching the ITV doc, and during lockdown, I spent some time reading up on the case and to the best of my knowledge these points have either all been raised previously or could potentially have been raised at trial and are therefore redundant.