Oh, I know. ("Hello driver, did you, um, mean to stop here?"

)
I am well aware leaf fall has been as tricky as ever for some routes this season, however the effects seem to have been more variable per location, which I suppose is down to the fact that this particular year's conditions have so far been less about widespread bands of storms bringing down leaves and soaking them into a layer of mulch, and more about how prone different leaves in specific locations are to causing wheelslip when crushed down on their own. This autumn has certainly been unusually calm from a wind storm point of view, so far!*
On the other hand, being less weather dependent does mean that localised predictions can now probably be more secure because you only rely on experts on lineside foliage and any prediction tools available to them, estimating a worst case scenario for disruption based on when the trees at each location are most likely to shed a certain proportion of leaves by themselves, rather than throwing quite so much meteorology into the mix as well. If the leaves have not dropped due to earlier storms, then it may take different amounts of time for subsequent conditions to remove them.
*I believe some stormier weather could now be due over the next few weeks, and a lot of trees are ready to drop a lot more leaves at a moment's notice, but we'll see what the exact effects are.
Ta!
See my third paragraph in reply to
Juniper Driver above. This year it seems effects are much more localised, bar a few specific days where things have "come to a head" if you will pardon the awful pun, and it is quite possible that an expert prediction of an extended range of leaf fall conditions can be made with a range of a few days. Leaf fall does not simply comply with broader pre-planned autumn timetabling, which was probably done some time ago on the basis of sharp stormy weather bringing a lot of leaves down in one go, as we have seen over the last few years. To extend the prediction of disruption a little, based on the advice of those monitoring lineside vegetation, is clearly prudent when we have spent so much of autumn with relatively placid weather, just waiting for leaves to come down all by themselves! Even if there are some quite strong winds over the next few days, it may take longer than usual with certain trees around the country.
It is also entirely sensible to use tools built for shorter-term disruption, such as web alerts / JourneyCheck, to provide prominent alerts to a short-term modification to what was evidently a timetable planned on something of a "best endeavours" sort of basis.
Anyway, I am very surprised that you are actually complaining of being informed of a potential (and possibly even quite minor) effect on punctuality with almost a month to go, no doubt based on a lot of hard work and complicated predictions relating to trackside electronics, traction knowledge, meteorology, you name it. If this was related to fixing something at Redhill station, you'd be complaining that you weren't informed in such a way...
(In any case, by 18 December you could well be seeing similar effects on punctuality due to winter weather! Maybe the reason does not matter after all...)