Ok, I've read the FAQ's and though there is some debate I can surmise that in homebrewed beer the most likely causes of that gawdamn awful and undesiarable cidery aftertaste are
1) sucrose used as a brewing adjunct
2) brewing at too high a temperature
3) poor sterility
its still unclear to me whether dextrose and glucose can cause that taste.... but anyway, my first brew was meticulously prepared basis sterility including carbon filtering and boiling and I used absolutely no sucrose but it did use 1kg dextrose...
result, only a week maturation , great head, body and initial taste but a gawdamn awful cidery aftertaste. May as well have thrown some apples in there.
therefore, I can only assume its brewing termperature (was around 27 deg c most of time, but it may have crept to 28 or 29 for a while).
So then, is it possible to brew at this temperature AND eliminate the cidery aftertaste as well ? Or is my only solution to cool the primary fermentation ?