Thanks for that..
I also got the "disrupted note" on the
NR» journey planner (with no reason why) but it didn't appear on the First Great Western site itself when I tried the journey on there...And I agree.. as long as you're on the part of the train that stops near the steps 3 minutes should be ok..
However, for various reasons, the evening out isn't happening at the last minute so I now don't need to worry about it as I'm at home.. (I should stop trying to go out Saturday evening.. this time last week my car was in the process of breaking down on the M4 en route to Brixton

)
The reason I wanted to get that train was that the next one arrived at Maidenhead 35 minutes later and the children would have been at home on their own (they are old enough but still)..
But as I said.. I'm here.. not going anywhere.. but still interested enough to see what happens tonight to check the NR departures board for Slough (very sad I know

)..