Further to Heating, but no hot water!?

With ref to the previous (very prompt answers)
It's a pumped system! Can I still bleed as per answer 3 or is there another way? there is a drain off near the boiler, and its around this area that I seem to hear trapped air making the water "gurgle" Can I somehow force water into this drain cock with the hope of pushing the air around, and out of the system??

Dave
March 2008