What kind of symptoms would I be suffering from in my small turbo EsCos if 1:- my Air Flow Meter was fooked and 2:- if my coolant temp sensor was knackered?

 

Generally poorer running, higher fuel consumption, poor idle. The eec does a fairly good job at coping with these sensors when they've failed but it'll be far from perfect. A code reader will tell you if the eec thinks the sensors are faulty.