If she asks for more time off this year (and you consent), then it can be unpaid of course. But if you tell her to take more time off then you will not have varied the contract to allow for that to be unpaid.
I've thought about this a bit more, and although I'll deal with the contractual/statutory position there is a big caveat at the end, so here goes...
If you want the 4 days in November, I think you need to deal with it now. Unfortunately it looks as though your contract is not very well drafted to deal with holiday in the first (holiday) year of employment because it appears to allow both the employer and the employee to choose up to 2 weeks of holiday regardless of whether that holiday is actually accrued! You might like to point this out to nannytax. Anyway, lets deal with it in stages:
- How much holiday will be accrued for the period?
If it is 34 weeks at 0.46 days a week it is 15.64 days. As she started on 9th May she will have been employed for 237 days in 2011 so the statutory minimum would be 22.4 days x 237 / 365 = 14.55 days, which could be rounded up to 15.
- How much holiday will be taken in the period (excluding the requested holiday)?
She has already taken 4 days of her choosing and 1 of yours. There are 4 bank holidays (Whitsun, August, Christmas Day and Boxing Day) and you want to choose another 4 days in November (which will make 5 days of your choosing: in 2011 a fair apportionment of the 2 weeks the contract allows for you to choose would be 8 days x 237 / 365 = 5.19 days so you are OK there). That makes 4 + 1 + 4 + 4 = 13 days.
- So how much holiday is left to be taken?
Contractually it looks like 16 - 13 = 3 days, the statutory minumum is 15 - 13 = 2 days, however the contract also says she is allowed to choose 2 weeks (8 days) and as she has only chosen 4 days so far so she is allowed to choose holiday which she isn't actually allowed to take! I think the most reasonable resolution of this is that she can choose all of the remaining 3 days.
- How much more holiday is she requesting in 2011?
12, 13, 14, 15, 19, 20, 21, 22, 27, 28 December i.e. 10 days.
So she wants 10 days, but only has 2 or 3 days paid holiday left to take - 7 or 8 days should therefore be unpaid. Note that this is different from your calculation because I have 'swapped' the 4 days in November and you forgot about the August Bank Holiday.
BUT
The fact that leave accrues in calendar years changes the whole picture. Look at it this way: if she took her holiday 2 weeks later and wanted the same amount of time off only 2 days of this (and 2 bank holidays) would fall in 2011. 11 days (and 1 bank holiday) would fall in 2012. Now she is entitled to choose 8 days in 2012, so it would be reasonable to make her take 3 of those unpaid. Perhaps it is therefore reasonable to allow her to bring forward her 8 days of own choice holiday from 2012, although you are not obliged to do so of course, and I am sure that you are less disposed to do so given that she has presented you with a fait accompli and this causes you a problem with your commitments in December.
If it was me, the December work commitments would be the biggest problem and whatever we do about paid/unpaid holiday is not going to change that. I would also be annoyed and embarrased that my contract doesn't seem to deal with the first partial holiday year correctly (0.46 days per week is too much and 2 weeks plus 2 weeks plus bank holidays is not right) as I am a bit anal about contract drafting (can you tell
?). On balance therefore there is not a lot to be gained by taking a strong position on this. I would therefore sit her down, explain all the issues including the holiday I want to nominate in November and say that I am willing to agree to grant her all the Christmas holiday paid, and that unless my plans change she will get a week off paid in November too, but this means bringing 8 days holiday forward and so the only paid holiday in 2012 will be the 8 days of my choosing and the 8 bank holidays she will get (including the extra one for the Queen's Diamond Jubilee).