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For the courtroom procedure pertaining to section 35, refer to The Consolidated Practice Direction (26 May 2005).

Section 36 allows an inference to be drawn when a person fails or refuses to account for objects, substances or marks found:

on his person; or
in/on his clothing or footwear; or
otherwise in his possession; or
in any place at the time of his arrest,
and when an investigating officer reasonable believes that the presence of such a mark, or substance or object may be attributable to that person’ participation in the commission of an offence specified by the officer.
https://www.reeds.co.uk/insight/legal-guidance-adverse-infer...

Special warnings
PACE Code C requires the use of special warning in certain circumstances. This is an additional caution. Legislation does not provide a specific form of wording for a special warning, but for an inference to be drawn it must be given in language that the suspect is capable of understanding.
https://www.college.police.uk/app/investigation/investigativ...