Thanks everyone. I figured that was the case and have spoken to the couple, so I think it's legit, but DH is not keen to book a week of annual leave if the wedding invitation gets pulled.
It hasn't happened to us personally, but it did happen to one of DH's work colleagues last year (couple basically overestimated how many people they could afford before they sent out the save-the-date cards). Very awkward I would imagine and DH's work mate was very peeved - flights accommodation had already been booked and paid for, mostly on deals, so not refundable.
I don't think it will be an issue with the couple we know (at least I hope not!). They know what they are up for - 2nd marriage for both.
QUOTE (PrincessPeach @ 25/02/2013, 12:08 PM)

As far as I knew you only send save the date cards to those who you will be inviting.
The only thing you may need to check with them is if there will be any functions on the day before the wedding you may be invited to. My friend had her hen's luncheon on the day before the wedding as most of us were flying in from around the country & it was a lot easier to organise for then.
Bride-to-be and I have chatted already, she hasn't mentioned anything like that. But I will check - good idea. Thanks