A method of supporting cables in a cable support arrangement in which the cable support arrangement comprises a substantially enclosed cable run, in which the method is characterised by: in a plurality of cables located in the substantially enclosed cable run and supported by a first cable support, without removing the plurality of cables from the substantially enclosed cable run, opening up a gap between a first subset of the plurality of cables located above the gap and a second subset of the plurality of cables located below the gap, in which the second subset of the plurality of cables located below the gap are located on and supported by the first cable support after opening up of the gap; in which the first subset of the plurality of cables located above the gap are separated by the gap from the second subset of the plurality of cables located below the gap; the method comprising, without removing any of the plurality of cables from the substantially enclosed cable run: introducing a second cable support into the gap and positioning the second cable support between the first subset and the second subset of the plurality of cables; mounting the second cable support in a position between the first subset and the second subset of the plurality of cables to a support structure (30, 34); and lowering onto the second cable support, the first subset of the plurality of cables so that the weight of the first subset of the plurality of cables is transferred via the second cable support to the support structure. in a plurality of cables located in the substantially enclosed cable run and supported by a first cable support, without removing the plurality of cables from the substantially enclosed cable run, opening up a gap between a first subset of the plurality of cables located above the gap and a second subset of the plurality of cables located below the gap, in which the second subset of the plurality of cables located below the gap are located on and supported by the first cable support after opening up of the gap; in which the first subset of the plurality of cables located above the gap are separated by the gap from the second subset of the plurality of cables located below the gap; the method comprising, without removing any of the plurality of cables from the substantially enclosed cable run: introducing a second cable support into the gap and positioning the second cable support between the first subset and the second subset of the plurality of cables; mounting the second cable support in a position between the first subset and the second subset of the plurality of cables to a support structure (30, 34); and lowering onto the second cable support, the first subset of the plurality of cables so that the weight of the first subset of the plurality of cables is transferred via the second cable support to the support structure. introducing a second cable support into the gap and positioning the second cable support between the first subset and the second subset of the plurality of cables; mounting the second cable support in a position between the first subset and the second subset of the plurality of cables to a support structure (30, 34); and lowering onto the second cable support, the first subset of the plurality of cables so that the weight of the first subset of the plurality of cables is transferred via the second cable support to the support structure.