Oo-er chillidogg. This caught my eye for a number of reasons. I am assuming you are the SA not the manager. Firstly, your organisation is required to assess the risks to pregnant workers or new mums arising from your undertaking. That's before any pregnant workers actually identify themselves. So are you saying that your organisation is too dangerous for ANY such worker? You say "waiting staff". How hazardous is that for pregnant workers - really! Secondly, no actual "RA" of an individual pregnant worker is required, (shock, horror!) but a reasonable discussion and review against the ALREADY EXISTING assessment of risk IS suggested. This is broadly comparable with a "return-to-work" type of discussion, and should be done by the relevant line manager. You can help by giving them the HSE guidance leaflet. This should be repeated/reviewed as appropriate. For permanent staff this would extend to post-mat leave return. Thirdly, just because there is a risk doesn't mean it MUST be reduced - maybe it is tolerable as it is. You sound out of your depth on this. Alhough technically the agency may or may not have a role here, it will be harder work to press them than to just do what's reasonable and simple for yourself - by this I mean organisationally (as I say,I do not see this as your SA function - it is a line manager role). Tread carefully - you appear to have decided in advance.

You may be aware of this information, however perhaps worth a peek as a reminder...http://www.hse.gov.uk/mothers/faqs.htm The agency should have a general RA in place, however you still have a duty of care to assess risk. Perhaps if you provide more info??