Join Date: Oct 2006
Location: London, UK
Programs: BA Gold, VS Silver, SQ Silver, IHG Plat Amb, Hilton Gold, Marriott Plat, Accor Silver, Radisson Prem
Posts: 16,872
You cannot go through security in T2 for a flight from T1.
You can, once airside, walk freely between T1 and T2 (and vice versa).