I work from home occasionally. When the system is working it is as if I am in the office, but a little slower. For security we use a dedicated telephone line for broadband. Often the system does not work.

It is also possible to work from home without this system. But obviously you cannot receive or send emails until you get back in the office. You can set your work email to automatically forward to your personal email, but this is unlikely to be as secure as your work email.

I think your employer may be legally obliged to make such provision for you.