Thank you for your advice - you have given me a lot of food for thought.
Fishpond, the nanny would need to care for both pre-schoolers during term time, but all three children during the school holidays. Does that not appear clearly in the specification? I will need to change wording if this is the case!
MrAnchovy - you're right, my criteria are rather narrow, which is why I hoped the essential vs desirable requirements would explain our priorities. Husband not that fussed whether nanny can speak Chinese or not - myself more so, but it is not the deciding factor.
Probationary period of 1 month rather than trial period of 3 weeks sounds like a useful change. I need to consider when to start this - return to work is in June, so I could start the nanny earlier whilst I am still at home.
I actually need childcare Mon-Fri, and currently have the two youngest booked full-time into nursery from when I return (toddler already attends part-time). The wraparound care for the eldest is the tricky bit, and I am uncomfortable at the thought of them spending so much time outside of the home environment, hence the thoughts about hiring a nanny.
What this means though, is that it could be any three days of the week with the nanny (or 4 or 5 days, but I think that the fabulous nursery has really benefited my two elder children), and three consecutive days may be more attractive to a prospective nanny than 3 with a break in-between. Also, this gives the opportunity for live-in, if I were to widen the area for my search (am thinking of the larger Chinese populations in Liverpool and Manchester).
If I were to put "3 days per week (days to be confirmed), with potential for increasing to 4 or 5", do you think this would be too vague? This would then make the salary indication more vague too, depending on live-in/out status.
Am too tired to make these changes tonight, but will try tomorrow based on your feedback, then need to get the whole thing translated!