Form E questions

Hi my stbx has filed his form E but omitted to put in £15,000 he inherited. I have a letter of the solicitors which states he received it but the solicitor is now saying that it hasnt been agreed that he did.
If the Form E is signed by both the stbx and the solicitor are they in breach of midconduct in court?
The solicitor agreed for some documents to go in the bundle for the FDA hearing which actually stated that he had received the inheritance and this letter was from the solicitors along with 2 of mine which referred to the inheritance. 2 days before the hearing the solicitor pulled them out stating that as they said without prejudice they coud not be put in and although mine didnt have that on she pulled one of mine stating it referred to a letter which had without prejudice on. The FDA hearing was cancelled so I am now awaiting a date.
Can the solicitor pull documents?
Is there any case law on the pulling of documents espeically as mine did not have without prejudice on?
Is the solicitor in contempt of court if so can I do anything? can they be referred to anyone
Is my ex in contempt of court if so can I do anything?

Also my stbx has inherited part of his late fathers home which his mom remains living in. Although at the moment this is not a realisable asset can it be used in the financial settlement. My argument is that although in good health now unfortuantley now one can predict how long they will be healthy for. His solicitor is saying is will not be included.

Thank you for any help and support