Calling it a 'trial period' does not exempt the employer from minimum wage legislation
There needs to be two distinct types of "trial period"
First one where someone goes to a workplace for about four hours to get an idea of the job and to see if they are capable of it.
For example, in a pub they could pull a few pints, use the till and get a general understanding of how things are done.
At the end of this both the employer and potential employee can decide what they want to do with regards a job.
I do not think that there should be the expectation of any pay for this kind of "trial period".
However, once someone has gone beyond this and is basically working unsupervised, just like any other employee in the workplace, I do not consider this to be a "trial period".
It is more like a free and easy way to get someone to do all the rubbish tasks for you because they are hoping to get an actual
job at the end of it.
This kind of "trial period" is a farce and should be called what it is "working a shift" and therefore it should be paid.
There is really no need for "extended trial periods" or "probationary periods" for employees in the UK.
You can employ someone in the UK and for the first two years of their employment you can dismiss them for any reason you like without fear of them claiming unfair dismissal and taking you to an ET*
- There are some things that don't have the two year period for ET claims, known as "automatically unfair reasons". These are things like pregnancy, discrimination and the like.