ok i did all of that Al

i got all downstairs ones hot including extension one

i opened up bath rad and then opened valve. I got a shhhhhh nopise splutter splutter then hot water,

opened 2 bedrooms one they got hot, bled them no noise

then one in hallyway got cold and one in lounge got cooler.

The 2 bedrooms ones i reduced valves to halfway and they was still piping hot.