Better to hang around at Paddington than Hayes & Harlington.
Agreed Hayes is pretty bleak these days at least you can eat and drink at Paddington both inside and outside the station.
You could even get one of the few bay seats on a 345 start up from the bay Platform, or if they are still running more comfortably on a 360 Heathrow Connect or even a
GWR▸ 387.
At least you are travelling before the timetable change!