Rad heat only when Hot water is off - even then rads badly

Air vents

When you say the LS valves are cracked open, how much do you mean - 1/2 turn or what?


They are just a nudge open like a 16th they still get hot.
 
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no valves that i can see just go straight into and out of the cylinder tank
There should be a valve, normally on the return. It's used to isolate the cylinder and to balance it. Otherwise the cylinder will take all the flow when CH and HW are on (valve in mid position.

What about the two return pipes which, you say, go to the boiler? Have you checked this out?

Where is the return from the rads connected? (It should be before the cylinder return!)
 

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