This means if it is just one person's word against another, forget it, unless the alleged offence was reported within 4 weeks of the commission of the alleged offence to the police.
I think 4 weeks is time enough. If it was really serious you would report it immediately without passing go and without collecting £200. If you took 4 weeks to think about it and then decided not to, then you weren't obviously that bothered about it.
If you are out of time then it is too bad and you have to just get on with your life: this has the advantage of helping the victim achieve closure. If you are really that bothered about it, you can do stuff to the perpetrator for revenge and take your chances with the law if what you do to the perpetrator breaks the law.
Or you may just end up like Frances Andrade.
Extensions are only permitted if you were kidnapped, imprisoned and kept as a sex slave, obviously. Then time would start to run the moment you were in a position to report the sexual abuse you suffered.
If the victim is a child then time runs from the time the parent/guardian/carer knew of the alleged abuse.
I think that is nice and clear, don't you?
What about the MPaedophile scandal, you scream?
These rules would also apply to MPaedophiles. The paper trail should be quite easy to follow. They will choose who they will throw to the wolves in the next 10 weeks and the "real" findings will not be made public till after the next General Election according to http://www.independent.co.uk/news/uk/politics/theresa-may-announces-details-of-independent-inquiry-into-paedophile-network-claims-9590545.html
It was perhaps a delicious revenge for Dickens who was by all accounts a bit of a clown http://www.theguardian.com/society/2014/jul/07/geoffrey-dickens-mp-campaign-child-abuse-taken-seriously to have given it to Brittan himself who is said to have been implicated at the link that is now removed from http://4bitnews.com/uk/explosive-corrosive-and-breathtaking-the-biggest-scandal-in-british-history. He may have been implicitly saying "I know it was you, and you will try to cover it up, but you will get found out, maybe not even until after I am dead, but you will get found out, and a tsunami of shit will hit you and those who helped you cover it up, Anyway, here it is. Do what you like with it."