Interpersonal relationships can become 'interesting' during this period, but deliberate vandalism would be self-selection for redundancy and possible criminal action. Management become very 'correct' - to the extent of external 'consultants' sitting in on meetings and taking notes - and you can bet on morale being significantly impacted during and for up to a year after a long consultation.

As pointed out below, the consultation period is before those being made redundant are (officially) selected. In large organisations - for extra fun - you have things called 'redundancy pools' based around areas of work or grades that all share a risk of redundancy but only (e.g.) 5 out of 25 will actually be made redundant. I should also point out that larger orgs often offer voluntary redundancy at enhanced terms within given 'pools' - unions where they exist will often bargain for enhanced terms.

Not a pleasant time but does give people weeks/months to find something else and take what financial precautions they can - and perhaps decide that 'VR' (voluntary redundancy) is possibly attractive. Yes, you do lose good people sometimes.

Often there is no requirement that they come in during this period, it's one form of "gardening leave".

Consultation happens before the decision is made* about who is leaving and who will still have a job.

* officially made