Gyles Brandreth took over as MP for the City of Chester seat from Peter Morrison at the April election 1992. He was selected for the seat in March 1991.
Brandreth wrote a book, published in 1999 called Breaking the Code, Westminster Diaries.
The following entry is 12 Sept 1991 by which date Brandreth is under no illusions as to what some of his prospective constituents think of Morrison- a disgusting pervert into little boys.
Since this edition, first published in 1999, Brandreth has updated the book in 2014 to add that he himself was a victim of child sexual abuse and also that he did not know the veracity of the allegations against Morrison. He also states that he does not know if there was a cover up, but he suggests whips do look after their own. 
It does not mention Brandreth going to the police either in the 90’s or recently. Perhaps it is time to state what he knows, and for the police to be proactive, as well as to be given correct finding and resources for the job of investigating child sexual abuse.
It is worth pointing out that Morrisons sister, Dame Mary Morrison, was a friend and lady-in-waiting to the Queen . His father John Morrison was a Lord Lieutenant of Wiltshire for many years . I believe that Thatchers rise to leader was helped by Morrisons father, but I have not at present got a reference for that. [Though see some of links found by @snowfaked]
For more on Morrison see Desiring Progress excellent post “Peter Morrison and the cover-up in the Tory Party – fully updated”  and more references in the links mostly provided by @snowfaked that are food for thought and may be useful in future research.
Please note that victims of abuse may be triggered by reading this information. The Sanctuary for the Abused [A] has advice on how to prevent triggers. National Association for People Abused in Childhood [B] has a freephone helpline and has links to local support groups. Other useful sites are One in Four [C] and Havoca [D]. Useful post on Triggers [E] from SurvivorsJustice [F] blog. Jim Hoppers pages on Mindfulness [G] and Meditation [H] may be useful.
 1999 Gyles Brandreth Breaking the Code Westminster Diaries ISBN 0 297 64311 8
 2014 Sept 12 Daily Mail ‘I was abused by my choir master’: In a brave and haunting account, TV star and ex MP Gyles Brandreth reveals the years of abuse he endured at prep school http://www.dailymail.co.uk/news/article-2754017/I-abused-choir-master-In-brave-haunting-account-TV-star-ex-MP-Gyles-Brandreth-reveals-years-abuse-endured-prep-school.html
 2014 Sept 16 Chester Chronicle Former Chester MP Gyles Brandreth says he was abused in his updated book http://www.chesterchronicle.co.uk/news/chester-cheshire-news/former-chester-mp-gyles-brandreth-7777260
 Wikipedia John Morrison https://en.wikipedia.org/wiki/John_Morrison,_1st_Baron_Margadale
 2015 July 26 Desiring Progress Peter Morrison – the child abuser protected by MI5, the Cabinet Secretary, and Margaret Thatcher – updated July 2015 https://ianpace.wordpress.com/2015/07/26/peter-morrison-the-child-abuser-protected-by-mi5-the-cabinet-secretary-and-margaret-thatcher-updated-july-2015/
 Jura Backgground via @Snowfaked https://news.google.com/newspapers?id=I1o_AAAAIBAJ&sjid=JlMMAAAAIBAJ&pg=914,3432599&hl=en
 2003 Apr 9 Telegraph Lord Margadale via @snowfaked http://www.telegraph.co.uk/news/obituaries/1427000/Lord-Margadale.html
 via @snowfaked Islay House seems to have an occultish setting as well. https://books.google.co.uk/books?id=H94PAQAAMAAJ&q=”Islay+House+has+365+windows,+one+for+every+day+of+the+year”&dq=”Islay+House+has+365+windows,+one+for+every+day+of+the+year”&hl=en&sa=X&redir_esc=y
 @cassandra cogno 1974 GREY LUNCHES WITH SIR KEITH JOSEPH & INVITES MRS CHARLES MORRISON TO BECOME ALBANY TRUST CHAIR https://bitsofbooksblog.wordpress.com/2015/04/11/1974-grey-invites-mrs-charles-morrison-vice-chair-of-the-conservative-party-to-become-albany-trust-chair/ Albany trust Grey & Mrs Sara Morrison
[A] Sanctuary for the Abused http://abusesanctuary.blogspot.co.uk/2006/07/for-survivors-coping-with-triggers-if.html
[E] SurvivorsJustice Triggers post http://survivorsjustice.com/2014/02/26/triggers-what-are-they-and-how-do-we-work-through-them/
This is all written in good faith but if there is anything that needs to be corrected please email email@example.com
cathyfox the truth will out, the truth will shout, the truth will set us free