angela84,
It seems that at your sons location the person he may be talking to is unaware of the relatively new option "The lifestyle Break" and maybe considering it as "Career Break".
It maybe worth considering your sons original application for "A Break". What process did he go through.
What was understood by both your son and management when the application was made and granted.
I would be saddened to see your son loose out on the rights of "The Lifestyle Break" if the process and application he has gone through was and is being considered as a "Career break".
From second hand experience of the Career break and some of the negatives that comes with it, both during and after it. I have tried looking for the company guide to both, to see if the process or events during (how share schemes or discount are treated in each case) are different which would inherently show how the company at your sons location viewed the application.
Alas there doesn't seem to be mention of "The Lifestyle Break" at
www.peopleattesco.com, only "The Career Break" (which I find odd in over 3 years after its inception), it may be worth looking at as the application form for the later is on there, I hope he didn't fill that form in. If you compare that process and the one which has been formally announced and commented on by the company through HR magazine ( in the link from The Mrs) the two process are clearly different on the return to work.
You are using the Term "lifestyle Break" which is good as it suggests there is knowledge of it at your sons location.
I have a theory what maybe happening but it would be an assumption so I'll refrain from making it as others here don't seem to like such a thing.
A simple statement like
"no, it was an application for the NEW Lifestyle break not a career break" may surfice, but due to the current climate be prepared to examine what happen within the process ( with the union) as proof that it should be considered what your son intended it to be and not a career break which is clearly different.