Technically no
However, if you have no idea about it, and cause structural damage, then you could find yourself against it in a big way.
If you have done your due diligence, ie contracted the services of a qualified engineer, who has issued you with a form 15 stating whether the wall was load bearing or partition, and you have employed the services of a qualified electrician and plumber to ensure services have been terminated.
Ensure your Environmental protection is in place (Control dust and noise), and you are confident of what you are doing, then there is no issue in doing the demolition yourself.
In fact, most people find demolition rather therapeutic.
i hope this helps you out, and good luck