Came to this thread late.
There are several Great Lies in this world;
There's a Cheque in the post
I'll love you in the morning
"Coordination agreed" from a Fighter Controller
and
Welcome to the calibrators!
The Law of Sod dictates that the calibrators will always be required to check the opposite end of the RW in use. Fact.
It was the same when 06 was being commissioned a couple of weeks earlier - 24 was in use. We expected that! See LoS above. At the request of the airport, the engineers and BAA the commissioning of the new ILSs was conducted at the weekend(s) to reduce impact on operations as much as possible. However, the commissioning on 06 encountered difficulties (which is why these things are flight checked) and had to continue during the week. THAT also incurred the wrath of various posters on this site. So as a previous poster said - there is never a good time a to conduct a calibration. But it has to be done. It's your interests we are looking after.