LHR Check-in times

I hope someone can help. I am flying into Heathrow from Budapest at 10 am. I am then taking the 18:05 flight back to NYC that same day.

My question is this: What time am I able to check-in for my flight? I would love to be able to check-in when I arrive in the morning and go into town for a few hours. Am I able to check-in anytime on the day of departure?

Thanks in advance for your answers.

[Decker]

If you use the kiosk check in

"Q When is kiosk check in available
A Kiosks open from 0600-2100 and customers can check in for flights between 1 to 9 hours prior to departure."

Thanks Decker for your quick reply -- you're the best! I am going to use the kiosk check-in.

[Decker]

""Shoulders of giants" and all that