Here is a great way to get free Euro Tunnel trips. 

First you are going to need a clubcard from Tesco, and secondly you are going to need an account on TopCashBack.  When you sign up for TopCashBack you can decide to have your payments in clubcard points instead of cash.  You can then use these club card points to purchase Euro Tunnel trips, at a rate of 3-1, so for instance a £20 earned on TopCashBack will get you 2000 clubcard points which will get you £60 worth of Euro Tunnel travel. 

If you have not already got a TopCashBack account, and would like to thank me for this idea, then consider using my "Tell-a-friend" link.
http://www.topcashback.co.uk/ref/Member824711988548
If you do not wish to use this link and prefer to use a link directly without the referral then here is the link.
http://www.topcashback.co.uk

How to add a clubcard to your TopCashBack account...
First of all, make sure you have a Tesco Clubcard. Go to the My Profile section of your Account, then Payment Details and fill in your Clubcard number to request your cashback payout. They can then transfer your cashback onto your Tesco Clubcard and Tesco will send you your vouchers in your Tesco Clubcard statement at regular intervals during the year.

How to order EuroTunnel using clubcard points.
There are a few terms and conditions, like for instance the return trip must start in UK not France, the person booking must travel and you need to book at least 14 days before travel.  It is probably best to hit this link and see for yourself, the "how to" is along the right hand side.
https://secure.tesco.com/clubcard/boost/eurotunnel-le-shuttle/UK-003223.prd


Hope you all have a very nice, and very cheap (free) journey.