Originally Posted by
thejohn
I don't know if you can just walk up but the last time I heard the LHR lost property is near the HEX T3 (Heathrow Express) ticketing hall below the Central Terminal area.
It's also now behind the Heathrow Express/Crossrail ticketing gateline so you'll need to ask to get through (or just get one (or two!) of the free tickets which is probably quicker).