https://www.stephens-scown.co.uk/employment/employment-right...
> Even though an employee has fewer employment rights in the first two years of their employment, an employer would be foolish to assume they have carte blanche to dismiss at will.
So while it's true that there's less protection for workers, there is no at will employment in the UK. Probation period probably comes closest to it but is much shorter.
'At will' in the US and the 2 year qualifying period in the UK are practically identical, apart from that the UK has a 2-week statutory notice period. The protections that remain in both the US and UK are almost entirely about protected classes. Even the classes themselves are virtually the same.
"Have they been there less than 2 years?" is the first thing legal will ask you when you want to sack someone in the UK. It's a wholly different status to being protected after the period.