That's assuming you haven't had a memo (generally ignored coff coff) saying that you must not be seen eating or drinking on the ambulance or indeed carry any food or drink on the ambulance! We have no scheduled half hour break in a twelve hour shift and if you have had half an hour on station after 11.30 you are deemed to have had your meal break. That said comms are pretty good about trying to make sure we have what they discreetly call a 10:80, even if it isn't till 4.30pm after a 7.00am start. I'd better not say what service this is for (in case THEY are watching) but I live in New Zealand where there are only two main ambulance service providers....