There are no
specific rules which relate to your occupation.
However, all employers have a statutory obligation to take all reasonable steps to minimize risks to the health and safety of their staff. In particular, your employer is obliged to carry out a risk assessment for your job (or for individual elements of your job). Employers with fewer than 5 staff do not have to keep a written record of such assessments (although they're advised to do so) but your employer must have a written document, which must be periodically reviewed and, if necessary updated.
You should ask your employer when the risk assessment was carried out (or reviewed) for your job. You should also ask to see a copy of that risk assessment.
This (general) page is for employers but it shows what your employer is obliged to do, by law:
http://www.hse.gov.uk/risk/index.htm
This (job specific) page goes further, by combining both legal obligations and 'good practice' for employers of staff on licensed premises:
http://www.hse.gov.uk/violence/toolkit/index.h tm
For further information, contact the HSE:
http://www.hse.gov.uk/contact/index.htm
and/or the ACAS Helpline:
http://www.acas.org.uk/index.aspx?articleid=15 65
Chris