I know CH copper pipes that run in unoccupied areas,loft/roofspace cellars etc should be lagged but I'm not sure if pipes that run under groundfloor floorboards should be. The floor is suspended about 3' above the ground so I would have thought the pipework would suffer heat loss. On the other hand would the heat coming from the pipes aid the heating as I think it does between floors.
Lagging CH pipes
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Although heat rises, very little of it will get through the floorboards, underlay and carpet to make any difference; most of it will just heat up the surrounding air.
Insulate the pipes, preferably with Waterboard approved insulation, which is larger diameter.
Pipes in the void between a ceiling and the floor above are not usually lagged.
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Radiators are designed to make large the ratio between outside surface area and internal volume of water. Tubing is pretty much the opposite, so it's best to insulate it - that way as much heat energy as possible reaches the radiators.
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