Breakfast recommendation near Gatwick for an 8 hour layover

First time heading to Europe from the US heading to Greece. Have an 8 hour layover in Gatwick from like 6am to 2pm-ish and am interested in popping out to London for a few hours. A lot of posts Ive seen had great recommendations but more for like a full day's worth of activities. Since my layover is early I figure I'd be down to grab a light breakfast and/or a tea near. Whether it's a place that is near great scenery, a historical landmark, or is just know for their AM cuisine, I'd love any recommendations.

*I'd rather not travel too far and have been reading about how great the trains are. Im down for that also
**Edit: I only know of London nearby but open to any other cities, towns that may be better considering my situation