Hi Melissa: I'm so sorry to hear this. Do you have something like craigslist.com there in the UK? At any rate, watch the online sites where people buy and sell items cheap. The tortoises may have been stolen so the thieves can sell them to make a quick buck. Put up fliers on utility poles with the picture of the tortoises like you've posted here advising they've been stolen. If you can afford to offer a reward, that would be a good idea too.