What's the best way to go about finding a nanny?
There are many routes: gumtree, nannyjob, netmums local childcare board, childcare.co.uk, word of mouth, ads in a local magazine or newsagent window or an agency.
Would anyone really be interested in one (short, 9-4.30) day a week?
It might be a nice short day for someone doing a 3 or 4 day job who wants some extra cash.
Is the paperwork/admin (tax, NI) etc. a pain and is it worth it for just a day a week?
It's not a total pain but as your nanny will very likely have a second job you'll need to operate full PAYE. With this is mind agree a gross wage up front - many nannies talk net still. You can outsource it to a payroll company but that would be expensive for 1 day a week, or if you're in the South-East there's an agency which will employ the nanny for you. In terms of is it worth it, well, it's definitely easier not to have to do it but how much is having your DC's cared for at home worth to you?
If you are a nanny, would you be put off by DC's mother being around while you are trying to do your job?
Yes and no. It can be difficult if the mother interferes but if you allow the nanny to get out and about/generally get on with things then it can work. Brutally honestly it will put some people off. Is there any way you could 'go out' in the morning to work at the library etc?
Can I use my employer's childcare voucher scheme and if so, how?
Yes, providing the nanny is registered with OFSTED. You will probably want to specify an already registered nanny when advertising as the norm is for the employer to cover the £103 cost of registration, which for a 1 day job probably outweighs your potential saving.
What experience, qualifications and qualities should I look for in a nanny?
That entirely depends how much you want to pay and what you want them to do. As a guideline, for 1 day a week, age relevant experience is probably your biggest concern. Someone with previous shared charge experience/WFH parents may be ideal as they're used to working with parents around. As you need nanny to be OFSTED registered they will have a basic childcare qualification, the standard for most is a level 3 NNEB/DCE/BTEC/NVQ. If you're confused at any point about what is/isn't suitable come and ask on here because there are lots. A 1st Aid certificate is a must, as is liability insurance, but any OFSTED registered nanny will have both of those.
It's difficult to pin qualities down but I'd be using key words like flexible, adaptable etc in the advertisement as you'll be working from home. Beynd that think about what you want in a nanny and work from there. Be as specific as possible: do you need a driver? Do they need to have their own car? Do you want them to be sporty, outdoorsy and active or happy to stay at home? Do you want them to do any household duties/cooking whilst they're with you (unusual in a 1 day job)?