Two people i know had the must attend memos, one was going on a course paid for by company and another had to travel 200 miles to main works/office.Both told to attend no matter what.
Both when they got there at different locations where met by a faceless senior manager, who thanked them for their time at the company, handed them a letter saying they where being made redundant immediately, and a box, to leave their mobile phone, works pass and laptop in along with company car keys.
They where told they would be paid for next 90 days and not to enter any workplace assosiated with the company, and given a rail warrant for the journey home.
One company was a major bank and the other a cereal maker amongst other stuff it produced.
Not a nice way to treat peeps but it happens quite frequently.