In reply to Trangia:
> Any idea what the thin bars on top of the wings are called and what their purpose is?
They're air-brakes, they increase drag and decrease lift altering the glide slope. There's a good article out there somewhere on the web by one of the recent Vulcan pilots, it details the conversion process and the unusual characteristics of the big delta wing and how it's flown, IIRC he covers the air-brake use. There's also an interesting bit on the pitch control reversal that occurs during certain flight phases, mostly landing when the pitching action caused by the elevators is briefly overpowered by the change in wing profile caused by the deflection (acting instead as flaps).
I suspect in this picture they're being used either to control speed in descent or to allow a higher power setting to be maintained while low and slow, if there's a problem brakes go away in an instant but idle engines take a while to spool up.
jk