Make sure your Passport's are in date everyone, or you'll not be leaving Dover!
If it does need doing, do it now, as its still off peak times and you'll have them back in 2 weeks or so.(£72 for the Passport, £7 for the PO to check and send)
The IPS states you need a minimum of 6 months left on it to travel.(I disagree with this from Personal Experience, but thas the above is the offical line, sst to stick with that)