Since I wrote this a couple of days ago the Daily Mail on 20th April has found 19 cases with people suffering dementia convicted of sex crimes, ten in last year See this link [ 5]
Is this the answer to a trial for Janner or will the kakocracy stop it? It is slightly different as @TonyHatfield rightly pointed out as the defendant is detained under the Mental Health Act but also check out at the end of this article, the other examples provided by other people
HT to Dan for finding this article which can also be found at Western Morning News  under the following slightly inaccurate headline.
Man found guilty of abusing six under-age girls
Posted : May 15, 2010
A DEVON man has been found guilty of abusing six under-age girls in a trial held in his absence at Exeter Crown Court.
Jurors yesterday unanimously found that Michael Collingwood, now 69, of Tedburn St Mary, near Exeter, committed 23 sex offences, including raping one girl.
Judge Paul Darlow instructed the jury to formally enter not guilty pleas to the other six sex offence allegations.
Jurors heard the trial in Collingwood’s absence after being told he suffers from severe dementia.
The jury forewoman, giving her verdicts, was required to say she found Collingwood “did the act charged” rather than being “guilty”, due to him not standing trial.
They were told, after the verdict, that he is currently in hospital under a Mental Health Act order, and his future will be decided at a further hearing.
He repeatedly abused six under-age girls in the 1980s and 1990s.
Investigating officer Detective Constable Wendy Fuller said after the verdict: “I want to pay credit to the immense bravery shown by the victims in coming to court and reliving the most traumatic experience of their childhood and beyond.
“I sincerely hope the result at court today will help them to somehow repair the considerable damage this depraved individual has caused.”
The court heard police investigated allegations involving four of the girls, in the 1990s, but the case was not brought to court.
A fresh investigation was launched last year after allegations were brought to light involving two other girls.
Collingwood called the rape victim a “good liar”, during that investigation.
end of Western Morning News Article
Also see this link for a report from earlier this year in London.He was found guilty of the 1991 assault following a trial at Harrow Crown Court on December 5 . However, the pensioner, who now suffers from dementia and Alzheimer’s 
Also via @MarkWatts
Rotherham man who was suffering from dementia was jailed in October for sex assault on young girl. http://www.thestar.co.uk/news/crime/rotherham-man-suffering-from-dementia-jailed-for-sex-assault-on-young-girl-1-692523
Eastbourne man who was suffering from dementia was jailed in February for stealing nearly £1m. http://www.eastbourneherald.co.uk/news/local/eastbourne-financial-adviser-jailed-for-stealing-1-million-from-clients-1-6569428
 2010 May 15 Western Morning News “Man found guilty of abusing six under-age girls” http://www.westernmorningnews.co.uk/Man-guilty-abusing-age-girls/story-11746382-detail/story.html#ixzz3XV4dh9jY Follow us: @WMNNews on Twitter | westernmorningnews on Facebook HT to Dan for finding this
 2015 Apr 16 Barrister blogger via Cathy Fox Lord Janner . Was the DPP right. What can complainants do next? https://cathyfox.wordpress.com/2015/04/16/barrister-blogger-lord-janner-was-the-dpp-right-what-can-the-complainants-do-next/
 2015 Apr 16 Cathy Fox text of CPS decision https://cathyfox.wordpress.com/2015/04/16/cps-decision-not-to-prosecute-janner/
 2015 Jan 20 Get West London Justice Catches up with paedophile pensioner http://www.getwestlondon.co.uk/news/west-london-news/justice-catches-up-paedophile-pensioner-8483973
 2015 April 20 Daily Mail Why is Labour Peer Lord Janner not being prosecuted because he has dementia? At least 19 defendants suffering with the disease have been convicted for sex crimes… and TEN were in the past year
[A] Sanctuary for the Abused http://abusesanctuary.blogspot.co.uk/2006/07/for-survivors-coping-with-triggers-if.html
[B] NAPAC http://www.napac.org.uk/
[C] One in Four http://www.oneinfour.org.uk/
[D] Havoca http://www.havoca.org/HAVOCA_home.htm
[E] SurvivorsJustice Triggers post http://survivorsjustice.com/2014/02/26/triggers-what-are-they-and-how-do-we-work-through-them/
[F] SurvivorsJustice Blog http://survivorsjustice.com/
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