Looks like they have tightened up the T&Cs this year, they seem pretty brutal, reads to me as though even if I cancel tomorrow, months ahead of Christmas they're still going to keep £40. There is a cut off date of 10th/12th December (it varies depending which part of the website or email you read!) which I can understand, as this stuff is special order from their suppliers, but I'm surprised they plan to keep deposits even for orders cancelled before that date.
Also you can't amend your order on the website, you have to phone them to make changes?
I thought it would just be like every other supermarket collection service in that I could place my approximate / expected order now but would be able to go on again nearer December (before the 10th, fair enough) and adjust quantities etc.