Hi. I'm flying from YOW to LHR arriving terminal 2 at 10:40am. I have then booked a seperate ticket to Prague with KLM departing terminal 4 at 5:10pm. My questions are, how do I get to terminal 4 from 2 and I'm assuming I have plenty of time with over 6hrs (presuming flights are on time). I know will have to connect bags, go through immigration, security etc. I'm mainly concerned about getting to terminal 4 from 2.