this is my understanding of the UK system too (note: I am an american). it's quite different in the US because, among other things, the jury is explicitly instructed not infer anything from the defendant's use of their 5th amendment protection against self-incrimination. even if you have a perfect explanation for what happened, it's often best to just be quiet and let the prosecution fall apart.
So, if you are arrested for beating up X, and you invoke your right to silence, THEN at trial you put forward a defence of "I wasn't there!" without any substantive evidence to back it up, the prosecutor can say "well, look, if there was an alibi, why didn't you tell the police about it?" The judge is supposed to then instruct the jury that they can draw an inference as to your honesty on the grounds you didn't bring it up during police interview.
The legislation that brings that into force are ss34-39 of the Criminal Justice and Public Order Act 1994.
https://www.legislation.gov.uk/ukpga/1994/33/part/III/crossh...
absolute nonsense
the statute with the meaning that you are trying to whitewash your argument applies only to application for dismissal of the indictment based on a claim it's reasonable for you to have provided earlier thereby preventing the proceedings progressing to court
precisely because that's the best advice that you will get from a solicitor in the circumstances!
I rather belaboured my earlier responses to this same question, because I wanted to make it understood how rarely there's any justification to arrest someone. UK LEO arrest people by default and they absolutely do not have a automatic right to arrest anyone and certainly not only to bring you in to interview.
There is an interesting TV show called 24 Hours in Police Custody[1] that follows people in the 24 hours after they are arrested. Naturally, there are many scenes of police questioning. Plenty of people do just answer "No comment" to every question, even after consulting a solicitor.
[1] https://en.wikipedia.org/wiki/24_Hours_in_Police_Custody