What charges would be brought against the following person (providing they were apprehended)?

Firstly, I am asking this purely out of curiosity. This scenario does not relate to me in any way, nor do I have any intention of acting upon it- I am merely following up on an intriguing TV programme I watched a week or so ago. UK-specific laws would be great. If a person breaks into a corporate building (e.g.,... show more Firstly, I am asking this purely out of curiosity. This scenario does not relate to me in any way, nor do I have any intention of acting upon it- I am merely following up on an intriguing TV programme I watched a week or so ago. UK-specific laws would be great.

If a person breaks into a corporate building (e.g., a company building, not a domestic or personal residence) out of hours, so there are no staff present, and as 'sport' sets about evading the security measures that are in place merely to reach a pre-arranged spot within said building; once this spot is reached, the person simply leaves the area.

Providing the person causes no damage (the idea is to leave behind no trace of their presence) and does not steal anything, what can they be charged with?

Thanks.
Update: Ed- let us assume they bumped into a police officer whilst leaving the property.
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