Are there any motorized zone valves in your central heating system - e.g to control upstairs and downstairs temperature separately via wall stats and timers? They look like this:
In that case you probably won't need a bypass as there is always an open circuit for the water to circulate. In any case Intergas say:
I hope the wall stat is also in the corridor - must be a long one, if it needs three rads!
I take that to mean that you don't have a stat in the downstairs corridor, but do have one in the upstairs corridor.
You really should have one. It will save you money on the gas bill, apart from now being a Building Regulation requirement for new installations.
Don't worry about it, your registered gas installer will know exactly what to do
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