It's at the back of the engine near the bulkhead and difficult to get to. The photo on the page is taken from about where the air filter is, looking towards the bulkhead.
Hi Jjad, thank you for the reply. The post you directed me to seems to suggest that removing the block drain plug is more hassle than it`s worth. The problem I have is that draining the system from the bottom hose only removes about 2 litres of fluid. To get a 50/50 mix of new coolant I need to somehow get more out. Am I the only one to have this problem? Any suggestions please. Thank you.