I may be about to book a holiday in Italy through Siblu, (subject to dh's go-ahead later!). I understand that if I have somebody elses reference number, ie you have referred me, we can both get £50 off our holidays! See here www.siblu.com/special_offers/50_off_your_holiday.php
I am using my Tesco clubcard vouchers so not 100% sure it will work, but others on moneysavingexpert say that it does, so worth a try!
So, if anybody has booked with Siblu, please let me know ASAP. First come first served.