I recieved this information from  eurotunnel recently. A full overnight closure of all freight shuttles, the night of September 23rd.  All this information is straight from www.eurotunnel.com Check the website for more news and details.Overnight temporary service suspension
between 22 – 23 September 2007
Maintenance works will take place during the night of 22nd to 23rd September 2007. This will result in the temporary suspension of all Freight shuttle departures between the following times:

The last freight shuttle departure on Saturday night
22 September 2007 will take place:

The first freight shuttle departure on Sunday morning
23 September 2007 will take place:

Please note that all timings are in local time.

If you wish to travel on the last departure please check-in no later than 60 minutes before the planned departure time. Access to the Calais and Folkestone Terminals will remain open during this time.

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 I also received these figures a few weeks ago from www.eurotunnel.com and i thought they made for interesting reading. If you look at the figures for the first half of 2007,  just over 700,000 trucks were transported on the shuttle, pardon est moi, le shuttle, which i think is pretty impressive.

If you look at it another way, if you say there are 182 days in 6 months, it works out at 3886.9 trucks a day, so i think seeing as were all friends here we can call that 3887 trucks a day or 162 trucks an hour or even 2.7 trucks a minute!!!! (thanks for the calculator Jo!).

Here are the figures as given by Eurotunnel.

The number of trucks carried rose to 707,422, an increase of 9% over the first half of 2006.
The number of cars transported (955,510) rose by a similar amount (8%), or 68,046 vehicles.