So, I'm doing MIA-LHR on BA 206 connecting to CX252 LHR-HKG. As BA 206 arrives into T3 I know I COULD stay airside but am not really interested in 6 hours of the CX lounge no matter how nice. T1/T4 and a massage and I'd possibly think differently. I don't recall anyplace in T3 to store luggage landside, I'm hoping someone will have a clue! I figure I have just enough time to run to Piccadilly Circus and Virgin Records. Either that or it's off to the LHR hellhole, er, Hilton. Given security concerns I'm thinking CX may have problems with me checking in, checking baggage and then leaving. Advice is GREATLY appreciated.