The annual and monthly fees would be £16 for a trip over 2 months for us (end of July to mid August) and £13 for subsequent years. That is on top of the toll costs. Our Liber-T would cost us €4 for the same period. I don't know how much it would cost to get one in France now, but the Eurotunnel deal doesn't look great value.Eurotunnel recently wrote to me with an offer on a Sanef Tag.
No application fee.
Payments will be taken via Direct Debit
From Sanef website...Mine is registered to my UK credit card. When are you planning to get one? I can enquire when we go to one of their offices to get the battery replaced on ours.