This isn't being talked about enough. Feels like one of those legislation moves designed to protect workers but instead forces the hand of employers to make quicker decisions, which may ultimately not be best for the employee. Currently if you work somewhere for say 20 months and get given the boot at least you've had a decent innings. Moving to a 6 month window basically means you need to have reached a conclusion about an employee within 5 months, which will often be prior to any formal performance review having been conducted. In turn I guess this means a more robust probation process is needed, a lot of organisations don't really take it seriously. My current job for example I literally had to ask my boss about it as she didn't know about it and hadn't mentioned it. I even worked at a FTSE100 that didn't even have a probation period.
When I was a contractor I got given my two weeks notice in December (not due to performance, the thing I was managing was transitioning to BAU), although they did then find another role for me at the same client prior to me leaving. Ironically I obviously started looking around when I was given the news so I ended up leaving shortly after through my own choice anyway, didn't feel too guilty about terminating my contact early (I wouldn't normally do this) since they'd literally announced the same in reverse a month prior