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Hi Ben,
IIRC, you had to reduce the flow to the radiators nearest the boiler and increase it the further away you got. This is because you had to allow hot water from the boiler to by-pass the radiators as well as flow through them so that some heat went into the rads, but also went onto the others in the run. You also had to take into account that the outlet water of each rad was not going to cool the hot water going directly to the other rads too much.
Quite a balancing act but still seemed to work. I think it's main reason was cost - you could save a lot of money on pipework (50% I guess) by just using one run instead of two like we normaly seee today in two-pipe systems. Plus the cost of labour to run the resturn leg as well...
Gary.
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