It is extremely important to obtain legal advice when faced with a disciplinary hearing. It is a hugely stressful time in your life, as it could result in you losing your job or receiving a final warning.
Lawyers are generally not permitted to attend any hearing on your behalf, although, they may be able to if the consequence of a finding against you could result in you being unable to practise in your career again. You are allowed to bring a trade union representative or fellow work colleague to a hearing, but many employees are not members of a trade union and invariably end up attending a meeting alone. It is vital therefore that you attend properly prepared.