I think the point here IO540 is that there's nothing advanced about obtaining relevant weather info from whatever source it may be, pertaining to that days flying.
To say that your average PPL instructor is unable to source that info is making a very wide generalisation. Do standards vary that much across the UK? If I had shown that level of incompetence at CPL level and later as a FI I'm sure I would have failed at the pre flight planning stage.