> I'm definitely not a lawyer, but I believe that the court may draw an inference from your silence. You are innocent and decided to remain silent only to have a perfect explanation that fits will all evidence known to the police weeks later. Why didn't you offer this earlier?

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.