The Drama Channel is free-to-air in the UK, and is available on Freeview 20, Sky 158, Virgin 190, BT and TalkTalk 020. You can catch up using the UK TV Play service (on several TV systems or just on your laptop/tablet/phone). Or set it to record using whatever technological marvels you've got under your TV.
The episode is number 5 (sometimes 4, depending on whether they show the first two episodes as one bumper ep, this time they didn't), called High Water. Crusoe and Friday find an abandoned boat in a tree - will it give them a way to escape the island? What will happen in the remaining 8 episodes if they do?? Who knows?! YOU will, if you watch, this Sunday! 6pm! Drama Channel! Be there!